单项选择题

The man who never tries anything new is a(n)（）on the wheels of pro gress.

A. obstacle
B. brake
C. break
D. block

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单项选择题

The department chairman （）with thanks the assistance of all the faculty members for getting the celebration ready in a short time.

A. expresses
B. declares
C. announces
D. acknowledges

单项选择题

There have been several attempts to introduce gayer colors and styles in men’s clothing, but none of them （）

A. has caught on
B. has caught him out
C. has caught up
D. take it known

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