根据《中华人民共和国政府采购法》的规定，采购货物或服务应采用( )方式的，其具体数

设y=2^x+sin2，则y’=______．

The policeman _______ that the drunk driver get out of his car.

A．said

B．commanded

C．connected

D．thought

分母是最小的质数，这样的真分数只有一个．______．

—Who is your new head teacher this semester?

—The woman _______ is wearing a red skirt.[ ]

A. whom

B. who

C. whose

D. which

在临床各类器官移植中疗效最显著的是（）。

A.心脏移植

B.肝移植

C.肾移植

D.脾移植

E.肺脾移植