单项选择题

After a show sales start early in the year, mobile homes have been gaining favor as ______ to increasingly expensive conventional housing.

A. a reaction
B. an addition
C. an introduction
D. an alternative
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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
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
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