单项选择题

This device looks simple enough, but () it is very complicated.

A. on the surface
B. in appearance
C. as a rule
D. in fact go

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36()

A. counting
B. covering
C. figuring
D. involving
单项选择题
() they have the opportunity, many Americans take their vacations away from home.

A. However
B. Wherever
C. Whatever
D. Whenever
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