单项选择题

A．He has nothing to do at that time.
B．He just wants to have a break.
C．He doesn’’t have math stuff.
D．He gets a hundred on the last test.
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单项选择题
A．They defend the bone against viruses.B．They prevent oxygen from entering the bone.C．They break down bone tissue.D．They connect the bone to muscle tissue.
A．They defend the bone against viruses.
B．They prevent oxygen from entering the bone.
C．They break down bone tissue.
D．They connect the bone to muscle tissue.
单项选择题
Which of the following is the best title for the passage
A．African Elephants and the Ivory Trade.
B．A Bid to Save the Elephant.
C．The Poachers.
D．Elephants in Danger.
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