单项选择题

Einstein's theory of relativity is so abstruse that very few people can appreciate it.

A．understand
B．enjoy
C．raise the value of
D．be thankful for
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单项选择题
All the children came through the cave safe and sound.
A．safe and unharmed
B．healthy
C．frightened
D．suffered
单项选择题
After the show, the crowd poured out of the theatre.
A．streamed
B．flowed
C．flooded
D．moved
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