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
No sooner had the words been spoken than he ______ that he was foolish.
A．realizes
B．had realized
C．realized
D．has realized
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
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