A. causes
B.charges
C.controls
D.reduces
解析:词义猜测题。根据第四段The release of dopamine in the front half of our brain is accompanied by a real smile可推断,prompt意为“引起”,故答案为A项。
答案:A
7.What can we conclude from the passage?
A.Real and fake smiles are started by the same part of the brain.
B.It’s hard to know the difference between real and fake smiles.
C.We can’t affect the release of dopamine in others’ brain.
D.We should try to smile even though we are not very happy.
解析:推理判断题。根据第四段What about putting on that happy face?Can the simple act of smiling bring pleasure?Yes.和末段内容可推断,答案为D项。
答案:D
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