题目内容

A．20-yearB．a 20-yearC．20-yearsD．a 20 years

A. 20-year
B. a 20-year
C. 20-years
D. a 20 years

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A．As forB．As toC．Judging byD．According to

As for
B. As to
C. Judging by
D. According to

【C7】

A. reserves
B. preserves
C. conservations
D. reservations

【C2】

A. rates
B. ratios
C. proportions
D. percentages

【C12】

A. to
B. about
C. for
D. in