如图为某类突触的信号传递示意图，这类突触中特定的神经递质一多巴胺的释放，会刺激大脑中的“奖赏”中枢，使人产生愉悦感，过后多巴胺会被转运载体转运回细胞。
请据图分析回答：
(1)图中①是__________，其中的多巴胺是从__________通过__________方式释放到突触间隙中。
(2)当多巴胺与__________结合，能使突触后膜兴奋，后膜电位变为__________。
(3)可卡因是一种神经类毒品，由图可知，其进入突触间隙后会影响__________过程，使突触后神经元__________，导致大脑“奖赏”中枢获得愉悦感，最终造成人对可卡因产生依赖的不良后果。
(1)突触小泡；突触前膜；胞吐。
(2)(特异性)受体；外负内正。
(3)多巴胺转运回细胞(多巴胺的回收)；持续兴奋。
解析：突触结构包括突触前膜、突触间隙和突触后膜；神经递质由突触前膜释放作用于突触后膜，使得下一个神经元兴奋或者抑制。
(1)图中的①是突触小泡，形成与高尔基体有关，当神经末梢有神经冲动传来时，突触前膜的突触小泡受到刺激，与突触前膜融合，以胞吐的方式释放神经递质，体现细胞膜的流动性。
(2)神经递质扩散通过突触间隙，与突触后膜上特异性的受体结合，使得突触后膜上电位变成外负内正，引起下一个神经元兴奋。
(3)据图分析，可卡因在突触间隙中，使得多巴胺转运回细胞，而没有分解失去活性，使得神经元持续兴奋。
我国保护少年儿童权益的专项法律是《中华人民共和国未成年人保护法》。（ ）
根据以下材料，回答题
If you don′t think a phone is the rightgift for a lover, the smart choice this year is a smart phone.
For people who don′t read instructions
The easiest-to-use phone is the iPhone. It′sthat has pushed it to the No.1 selling position, surpassing the Motorola Razr.The iPhone′s touch screen is easy to operate and it′s also easy to customize (用户化). The iPhone can run allsorts of applications such as those help you to lose weight, identify a song onthe radio, find a restaurant or do many other things.
For the futurist
The T-Mobile G1 is very popular as it is thefirst phone to offer a Google browser, meaning that you′re getting the real webon your phone, but it′s the phone′s potential that qualifies it for the futurist.The exciting applications are interesting, but they don′t always work smoothly.Sometimes it is hard to use the applications it comes with. The system shouldimprove as it becomes more popular, so it holds great promise. With fewrestrictions on the design of applications for the phone,
the G1 could be the first phone toincorporate (整合) some of the coolest.
For the road warrior
The new BlackBerry Storm is something likethe equivalent (等同物) of a mullet--a business up front, party in the back. It stillincorporates the serious mail and organization features that have endeared (使受钟爱) these phones to business people. The 3.25-inch is bright anddetailed and it′s a decent size for watching videos on the go.
For the Luddite (反对技术进步的人)
For those who can′t handle buttons and newfeatures, there is the Samsung Jitterbug Dial. Some people are Luddites whojust want a few large buttons to make calls. That′s it, just calls. That makesit even easier to use an iPhone.
What would be the best title forthe passage (no more than 6 words)
________________________________________________________________________
简述学生的义务。
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