溢流阀是液压系统的（）装置。 A.控制流量 B.安全保护 C.换向 D.调速

—John is in a bad mood these days. Do you know why?

—His grandfather has just passed away. Let’s try to _______.

A．bring him up

B．wake him up

C．cheer him up

D．give him up

矫顽场强度

All these new students will be divided ________ 12 classes. Then these classes will be divided ________ the teachers.

A．to; in

B．among; into

C．into; by

D．into; among

要办一届______、______的奥运会被确定为北京奥运会目标，奥运会马术比赛易地______举行。

流行性感冒的临床特征是（）。

A.因部烧灼感

B.乏力

C.肌肉酸痛

D.急起高热

E.咳嗽咳痰