Although adolescent maturational and developmental states occur in an orderly sequence, their timing ______ with regard to onset

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问题 Although adolescent maturational and developmental states occur in an orderly sequence, their timing ______ with regard to onset and duration.

选项 A、lasts
B、varies
C、falters
D、accelerates

答案B

解析 vary变化,呈多样性。last延续。falter蹒跚;犹豫。accelerate加速,增加。
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