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.
<上一题 目录 下一题>
热门 试题

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.
单项选择题
A．He is very quiet.B．He gives amusing lectures.C．He should give more than one series of talks.D．He lectures only to the serious students.
A．He is very quiet.
B．He gives amusing lectures.
C．He should give more than one series of talks.
D．He lectures only to the serious students.
相关试题