单项选择题

A．There may exist some intelligent life.
B．There isn’t any intelligent life.
C．There may exist some living things.
D．There may even be no living things.
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填空题
The average life expectancy in 21 st century will be______.
单项选择题
A．They haven’t received the invitation yet.B．They won’t be flee at the weekend.C．They are expected to come to the dinner.D．They haven’t replied so far.
A．They haven’t received the invitation yet.
B．They won’t be flee at the weekend.
C．They are expected to come to the dinner.
D．They haven’t replied so far.
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