单项选择题

The Channel Tunnel is one of the biggest engineering projects ever（）

A. understated
B. undertaken
C. undergone
D. underneath

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单项选择题
The tests show the earlier in life a person hears a sound the longer it is （）

A. retained
B. preserved
C. remained
D. reserved
单项选择题
When moisture on the skin （）, it draws heat out of the body.

A. evaporates
B. dilutes
C. diffuses
D. dissipates
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