单项选择题

What might be the obstacles for transmitting antenna and receiver antenna to get connected

A. Deep oceans.

B. High mountains.
C. Long rivers.

D. Huts.
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单项选择题
According to officials, what percentage of the flights at O’ Hare were delayed during the first seven months of this year
A. 65%.
B. 56%.
C. 75%.
D. 57%.
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