单项选择题

We are totally unable, after decades of experiment, to replicate ancient glazed pottery（）

A. produce
B. manufacture
C. dramatize
D. duplicate

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单项选择题
The（）of such I. Q. tests full of questions on American culture was not questioned at that time

A. significance
B. validity
C. efficiency
D. justification
单项选择题
He’s watching TV He’s（）to be cleaning his room.

A. know
B. supposed
C. regarded
D. considered
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