为什么说实践是认识发展的动力。
实践推动认识由低级到高级、由浅入深、由片面到更多方面的发展。主要表现在：第一，实践的发展不断地给认识提出新课题，规定了认识发展的方向，推动人们从事新的探索，形成新的理论。 第二，社会实践的发展给解决新问题提供了主要的经验材料，使发现新的科学知识成为可能。任何认识问题的解决，都要依据大量的经验材料。 第三，社会实践给人们认识事物不断提供日益完备的认识工具和技术手段，从而冲破了人的感官的局限，扩大了人类的认识领域，拓展了人类的认识视角，推动了人类认识的发展。 第四，社会实践不断锻炼和提高人们的思维能力。人们在改造客观世界的同时，也改造了自己的主观世界。社会实践水平越高，人们的认识能力就越强。
学校将组织一次英语演讲比赛，打算邀请外教（John）来做评委。请你（Li Yuan）给他写一封e—mail，内容包括：?
·邀请他担任评委（judge）；?
·告知他比赛安排（如：时间、地点等）；?
·希望他赛后进行点评；?
·期待他能接受邀请。
A.I am free on Sunday.
B.See you then!
C.Where are you planning to go?
D.No,thanks.
E.I need a break!
F.Would you like to join us?
G.That is a lovely place.
H.When shall we leave?
Daniel:How are you doing,Linda?
Linda:To be honest,I am really tired of my
Heahh care experts have long drawn attention to the problems of eating too much sah．There isstrong evidence that a diet high in salt can lead to raised blood pressure．Since high blood pressure is amajor factor in heart disease．it makes sense to cut down on the salt people eat．?
In the past，food contained very little salt，and people added it to their food at the table．Very fewpeople ?add ?salt this ?way ?nowadays．However，the ?salt ?content ?of processed ?foods has ?gone ?updramatically．It’s now estimated that over three．quarters of the salt in the average diet comes fromprocessed foods，eaten without our being aware of it．?
Salt is added to food partly to extend shelf-life．but more often it’s dropped in to make up for theflavor lost in the manufacturing process．This is especially true of ready meals and highly processedfoods．but it’s also true of such basic food as biscuits，soups，and even bread．Much mass—producedbread，for instance．contains so much salt．half a gram for every hundred grams of bread--that it’sofficiallv classified bv the UK government as high——salt food．Salt has to be added to the bread becausefast Droduetion cuts down the time for the flavor to develop．Without added salt，the bread would tastelike paper．?
In the UK，the government has launched a campaign to cut down on the salt people eat．The UK Food Standards Agency argues that nearly half of the UK’s population eat too much salt—9．5 9 a day onaverage．Its aim is to bring down the average t0 69 a day．The idea is to cut the salt content in 85 keyfood categories such as bread．meat．and cakes．?
?What is the passage mainly about?
Heahh care experts have long drawn attention to the problems of eating too much sah．There isstrong evidence that a diet high in salt can lead to raised blood pressure．Since high blood pressure is amajor factor in heart disease．it makes sense to cut down on the salt people eat．?
In the past，food contained very little salt，and people added it to their food at the table．Very fewpeople ?add ?salt this ?way ?nowadays．However，the ?salt ?content ?of processed ?foods has ?gone ?updramatically．It’s now estimated that over three．quarters of the salt in the average diet comes fromprocessed foods，eaten without our being aware of it．?
Salt is added to food partly to extend shelf-life．but more often it’s dropped in to make up for theflavor lost in the manufacturing process．This is especially true of ready meals and highly processedfoods．but it’s also true of such basic food as biscuits，soups，and even bread．Much mass—producedbread，for instance．contains so much salt．half a gram for every hundred grams of bread--that it’sofficiallv classified bv the UK government as high——salt food．Salt has to be added to the bread becausefast Droduetion cuts down the time for the flavor to develop．Without added salt，the bread would tastelike paper．?
In the UK，the government has launched a campaign to cut down on the salt people eat．The UK Food Standards Agency argues that nearly half of the UK’s population eat too much salt—9．5 9 a day onaverage．Its aim is to bring down the average t0 69 a day．The idea is to cut the salt content in 85 keyfood categories such as bread．meat．and cakes．?
Which of the following is classified as high—salt food by the UK government?
Heahh care experts have long drawn attention to the problems of eating too much sah．There isstrong evidence that a diet high in salt can lead to raised blood pressure．Since high blood pressure is amajor factor in heart disease．it makes sense to cut down on the salt people eat．?
In the past，food contained very little salt，and people added it to their food at the table．Very fewpeople ?add ?salt this ?way ?nowadays．However，the ?salt ?content ?of processed ?foods has ?gone ?updramatically．It’s now estimated that over three．quarters of the salt in the average diet comes fromprocessed foods，eaten without our being aware of it．?
Salt is added to food partly to extend shelf-life．but more often it’s dropped in to make up for theflavor lost in the manufacturing process．This is especially true of ready meals and highly processedfoods．but it’s also true of such basic food as biscuits，soups，and even bread．Much mass—producedbread，for instance．contains so much salt．half a gram for every hundred grams of bread--that it’sofficiallv classified bv the UK government as high——salt food．Salt has to be added to the bread becausefast Droduetion cuts down the time for the flavor to develop．Without added salt，the bread would tastelike paper．?
In the UK，the government has launched a campaign to cut down on the salt people eat．The UK Food Standards Agency argues that nearly half of the UK’s population eat too much salt—9．5 9 a day onaverage．Its aim is to bring down the average t0 69 a day．The idea is to cut the salt content in 85 keyfood categories such as bread．meat．and cakes．?
What can be inferred about people’s use of salt in the past?
Heahh care experts have long drawn attention to the problems of eating too much sah．There isstrong evidence that a diet high in salt can lead to raised blood pressure．Since high blood pressure is amajor factor in heart disease．it makes sense to cut down on the salt people eat．?
In the past，food contained very little salt，and people added it to their food at the table．Very fewpeople ?add ?salt this ?way ?nowadays．However，the ?salt ?content ?of processed ?foods has ?gone ?updramatically．It’s now estimated that over three．quarters of the salt in the average diet comes fromprocessed foods，eaten without our being aware of it．?
Salt is added to food partly to extend shelf-life．but more often it’s dropped in to make up for theflavor lost in the manufacturing process．This is especially true of ready meals and highly processedfoods．but it’s also true of such basic food as biscuits，soups，and even bread．Much mass—producedbread，for instance．contains so much salt．half a gram for every hundred grams of bread--that it’sofficiallv classified bv the UK government as high——salt food．Salt has to be added to the bread becausefast Droduetion cuts down the time for the flavor to develop．Without added salt，the bread would tastelike paper．?
In the UK，the government has launched a campaign to cut down on the salt people eat．The UK Food Standards Agency argues that nearly half of the UK’s population eat too much salt—9．5 9 a day onaverage．Its aim is to bring down the average t0 69 a day．The idea is to cut the salt content in 85 keyfood categories such as bread．meat．and cakes．?
What is the main reason for reducing salt in food?
My boyfriend really enjoyed canoeing (划独木舟), and it took me a while to finally persuade himto take me on a canoe trip. Despite his great skill, he was nervous about my safety and described manyterrible situations that could happen. "They could also not happen," I said. I wanted to prove that I wastough and capable of adventuring.?
This would be a romantic adventure. We would row the canoe on the lake under a beautiful bluesky. I was confident it would all go according to plan.?
It did not go as planned. Instead,?it all went downhill. We hit a headwind (逆风). The flies werethe worst. An unknown animal outside our tent in the night forced us to get up twice to scare it away.We walked through knee-deep mud; we moved around so many fallen trees that we lost the wayfrequently. We had an unexpected thunderstorm on our second night. We hid in our tent from the bugs(虫子), too tired and bitten to even hold each other. When we were finally back in the car, my skinwas hot and angry with bug bites, I had barely slept in 72 hours and I had an injury on my forehead fromhitting it on the canoe.?
Yet I realized that I wanted to do it all again. Because I swam in a lake so warm it felt like asummer pool. ?I ate lunch on an island with the most beautiful pine trees. ?I' d also never beforeappreciated how thunder can make the ground tremble. I know why my boyfriend loves canoeing somuch. It' s for the challenge, the space, and the beauty of moving forward with your own two hands ina place of natural wonder. He didn' t say "I love you. " He said I was a good partner. I' ve foundsomething that I really like to do. That' s the more important thing.?
What would be the best title for the passage?
My boyfriend really enjoyed canoeing (划独木舟), and it took me a while to finally persuade himto take me on a canoe trip. Despite his great skill, he was nervous about my safety and described manyterrible situations that could happen. "They could also not happen," I said. I wanted to prove that I wastough and capable of adventuring.?
This would be a romantic adventure. We would row the canoe on the lake under a beautiful bluesky. I was confident it would all go according to plan.?
It did not go as planned. Instead,?it all went downhill. We hit a headwind (逆风). The flies werethe worst. An unknown animal outside our tent in the night forced us to get up twice to scare it away.We walked through knee-deep mud; we moved around so many fallen trees that we lost the wayfrequently. We had an unexpected thunderstorm on our second night. We hid in our tent from the bugs(虫子), too tired and bitten to even hold each other. When we were finally back in the car, my skinwas hot and angry with bug bites, I had barely slept in 72 hours and I had an injury on my forehead fromhitting it on the canoe.?
Yet I realized that I wanted to do it all again. Because I swam in a lake so warm it felt like asummer pool. ?I ate lunch on an island with the most beautiful pine trees. ?I' d also never beforeappreciated how thunder can make the ground tremble. I know why my boyfriend loves canoeing somuch. It' s for the challenge, the space, and the beauty of moving forward with your own two hands ina place of natural wonder. He didn' t say "I love you. " He said I was a good partner. I' ve foundsomething that I really like to do. That' s the more important thing.?
Which of the following happened during their canoe trip?
My boyfriend really enjoyed canoeing (划独木舟), and it took me a while to finally persuade himto take me on a canoe trip. Despite his great skill, he was nervous about my safety and described manyterrible situations that could happen. "They could also not happen," I said. I wanted to prove that I wastough and capable of adventuring.?
This would be a romantic adventure. We would row the canoe on the lake under a beautiful bluesky. I was confident it would all go according to plan.?
It did not go as planned. Instead,?it all went downhill. We hit a headwind (逆风). The flies werethe worst. An unknown animal outside our tent in the night forced us to get up twice to scare it away.We walked through knee-deep mud; we moved around so many fallen trees that we lost the wayfrequently. We had an unexpected thunderstorm on our second night. We hid in our tent from the bugs(虫子), too tired and bitten to even hold each other. When we were finally back in the car, my skinwas hot and angry with bug bites, I had barely slept in 72 hours and I had an injury on my forehead fromhitting it on the canoe.?
Yet I realized that I wanted to do it all again. Because I swam in a lake so warm it felt like asummer pool. ?I ate lunch on an island with the most beautiful pine trees. ?I' d also never beforeappreciated how thunder can make the ground tremble. I know why my boyfriend loves canoeing somuch. It' s for the challenge, the space, and the beauty of moving forward with your own two hands ina place of natural wonder. He didn' t say "I love you. " He said I was a good partner. I' ve foundsomething that I really like to do. That' s the more important thing.?
What does the sentence“it all went downhill”in Paragraph 3 mean?
My boyfriend really enjoyed canoeing (划独木舟), and it took me a while to finally persuade himto take me on a canoe trip. Despite his great skill, he was nervous about my safety and described manyterrible situations that could happen. "They could also not happen," I said. I wanted to prove that I wastough and capable of adventuring.?
This would be a romantic adventure. We would row the canoe on the lake under a beautiful bluesky. I was confident it would all go according to plan.?
It did not go as planned. Instead,?it all went downhill. We hit a headwind (逆风). The flies werethe worst. An unknown animal outside our tent in the night forced us to get up twice to scare it away.We walked through knee-deep mud; we moved around so many fallen trees that we lost the wayfrequently. We had an unexpected thunderstorm on our second night. We hid in our tent from the bugs(虫子), too tired and bitten to even hold each other. When we were finally back in the car, my skinwas hot and angry with bug bites, I had barely slept in 72 hours and I had an injury on my forehead fromhitting it on the canoe.?
Yet I realized that I wanted to do it all again. Because I swam in a lake so warm it felt like asummer pool. ?I ate lunch on an island with the most beautiful pine trees. ?I' d also never beforeappreciated how thunder can make the ground tremble. I know why my boyfriend loves canoeing somuch. It' s for the challenge, the space, and the beauty of moving forward with your own two hands ina place of natural wonder. He didn' t say "I love you. " He said I was a good partner. I' ve foundsomething that I really like to do. That' s the more important thing.?
Why did the writer want to have a canoe trip with her boyfriend?
