单项选择题

Scientists now know that matter and energy are very closely related to（）

A．oneself
B．themselves
C．each other
D．one another

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单项选择题

This study proves that there is no life on Mars. But（）man still（）there is.

A．a great deal... think
B．a great many... think
C．much... thinks
D．many a... thinks

单项选择题

His health is（）

A．as poor, if not poorer than, his sister
B．poor as his sister' s if not poorer
C．as poor as, if not poorer than, his sister' s
D．as poor, if not poorer than, his sister' s