单项选择题

The required number of electrons in noble gases’ outer shell is（）

A. reactive
B. lightest
C. important
D. complete
E. flammable
F. unnecessary

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The existence of liquid water is a necessity for a life-support（）

A．Right
B．Wrong
C．Not mention
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The findingof the study is most significant in that learning（）

A．is full offun
B．is visualized
C．happens unconsciously
D．becomes unnecessary
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