单项选择题

Which of the following is closest in meaning to the phrase" leveled off" (parA．2, Line 6)（）

A. become very popular
B. stopped being popular
C. reached its lowest level in popularity
D. stopped increasing in popularity

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单项选择题
The harm radiation has done to the Apollo crew members （）

A．is insignificant
B．is enormous
C．seems overestimated
D．remains unknown
单项选择题
23（）

A．that
B．whom
C．which
D．what
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