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单项选择题

In one single year, rats eat 40 to 50 times ______ weight.

A. its
B. their
C. ones
D. of
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单项选择题You don't look quite ______ today. What's the matter with you

A. you
B. your
C. your own
D. yourself

单项选择题Everybody is here, ______

A. isn't everybody
B. isn't it
C. isn't he
D. aren't they