题目内容

The little boy hid himself ______ the table.

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一等水头变速滤池，分4格，设计滤速为8m/h，正常过滤时，第1格滤速为6m/h，第2格滤速为10m/h，当第1格滤池反冲洗时，如果过滤总流量不变，且滤速按相等比例增加时，第2格滤池的滤速为（）m/h。

A. 13.3
B. 12.3
C. 12
D. 10

My sister is two years ______ (old) than I.

Steel is made ______ iron.

A. on
B. at
C. from
D. in

I must finish my work ______ I go home.

A. in front of
B. in
C. on
D. before