摘要： The most common thing to do on the earth can be a big threat if properly, according to Chen Shanguang, designer of the spaceship. A. doesn’t handle B. not handled C. not handling D. having not handled

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The most common thing to do on earth, such as walking and eating, can be big threat if not handled(处理)properly in space．

A.
a;/
B.
/;/
C.
a; the
D.
/; the

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The most common thing to do on earth，such as walking and eating，can be big threat if not handled properly in space.

A．a；不填 B．不填；不填 C．a；the D．不填；the

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The most common thing to do on earth, such as walking and eating, can be ________ big threat if not handled(处理)properly in ________ space．

[　　]

A．a;/

B．/;/

C．a; the

D．/; the

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The most common thing to do on earth, such as walking and eating, can be ________ big threat if not handled(处理)properly in ________ space．

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The most common thing to do on earth, such as walking and eating, can be big threat if not handled(处理)properly in space．