单项选择题

22（）

A．that
B．where
C．how
D．whether

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单项选择题
21（）

A．then
B．more
C．as
D．like
单项选择题
Which of the following statements is true
A．Recently, two American astronauts have landed on Mars.
B．The surface of Mars is very hot.
C．The journey to the moon started the future exploration in space.
D．There is life in Venus.
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