答案:A
7.It can be inferred that the higher the dopamine level is,________.
A.the harder it is for you to break the bad habit
B.the less pleasure you will get
C.the stronger bad habits will become
D.the more you'll want to get a reward
解析:推理判断题。根据第三段内容可知,多巴胺是一种感知快乐的化学物质,它使大脑不断期望得到某种犒赏。最后一段中的“Exercise itself raises dopamine levels”能进一步证明,多巴胺的水平越高,人们就越想得到某种犒赏。
答案:D
8.Why does Volkow eat popcorn even though he doesn't like it?
A.Because he recognizes the importance of it.
B.Because it is needed for normal growth of the body.
C.Because he can't resist the temptation of it.
D.Because it makes him relaxed to eat popcorn while seeing films.
解析:细节理解题。根据第四段内容可知,人们往往高估自己抵制身边诱惑的能力,这使他们为摆脱坏习惯而作出的努力毁于一旦。Volkow就是因为抵抗不了这种诱惑才吃爆米花的。
答案:C
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