試題詳解

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(A) Animal evidence suggests that the more you take an addictive drug, the more dopamine receptors you wipe out.
(B) They hope these genes will be targets for designer drugs that one day will strike at addiction with precision.
(C) Addictions have been shown to be anywhere from 67 percent to 80 percent hereditary.
(D) The dopamine system also can be turned on by novelty.