单项选择题

Different cultures have different communication ().

A. styles
B. signals
C. designs
D. symbols

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单项选择题

While he was climbing the high mountain, he had his leg ().

A. broke
B. break
C. broken
D. breaking

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The United States is composed of fifty states, two of () are separated from the others by land or water.

A. them
B. that
C. which
D. those

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