单项选择题

37（）

A．pushing
B．pulling
C．milling
D．carrying

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单项选择题
36（）

A．job
B．work
C．career
D．duty
单项选择题
The text seems to imply that other forms of life in the cosmos ______.
A．have never existed
B．have all died out
C．may exist in the future
D．are in existence
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