我们了解世界的窗口是[ ] A．稳定的国际环境 B．规范的世界性贸易市场 C．丰

细菌性痢疾（）。

A.菌血症

B.败血症

C.脓毒败血症

D.病毒血症

E.毒血症

一Long time no see!

—I’ve just retuned I         to Zhengzhou for a meeting last month

A am sent    B was sent    C am sending      D was sending

—The research on the new bird flu virus vaccine is challenging and demanding. Who do you think can do the job?

—____ my students have a try?

A．Shall

B．Will

C．Could

D．Should

哪颗星最亮？

聘书、邀请书都属于书信。