单项选择题

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

A. lasts
B. varies
C. falters
D. accelerates
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单项选择题
Early critics of Emily Dickinson’s poetry mistook for simplemindedness the surface of artlessness that in fact she constructed with such ______.
A. astonishment
B. vexation
C. allusion
D. cunning
单项选择题
Data concerning the effects on an small population of high concentrations of a potentially hazardous chemical are frequently used to ______ the effects on a large population of lower amounts of the same chemical.
A. verify
B. redress
C. predict
D. realize
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