题目内容

We all look forward to the day when the scientists can _________ more secrets of the universe.

A) treat
B) discover
C) support
D) trap

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If you can't ________ a new copy, perhaps you can find a second-hand copy.

A) retire
B) afford
C) network
D) wave

Most people didn’t ________ the harmful effect of smoking until they get lung cancer.

A) exist
B) compare
C) bite
D) realize

Tom held a big party to _________ his 24th birthday two days ago.

A) whisper
B) celebrate
C) value
D) pretend

在RLC串联电路中，UR=16V，UL=14V，UC=2V；则总电压为（）。

A. 28V
B. 20V
C. 32V
D. 0V