单项选择题

Though steam engines have now passed the ______ of their usefulness, their heritage remains.

A. prime
B. era
C. epoch
D. dafe
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Do you like those kinds of cigarette ______ cigarette agrees with me.
A. Hardly no
B. Nearly no
C. Barely no
D. Almost none
单项选择题
During the summer vacation, Mary worked on a (an) ______ basis as a salesman, taking 8 percent of everything she sells.
A. salary
B. income
C. commission
D. pension
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