試題詳解

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(A) These brain structures use a chemical messenger called serotonin.
(B) Unfortunately we still do not know the exact cause or causes of OCD.
(C) It is an emotion that tells you to respond, react, protect yourself, and do something.
(D) Other studies note that genes seem to be only partly responsible for causing the disorder.
(E) Studies have shown that genes play a larger role when OCD starts in childhood compared to when it starts in adulthood.