治理黄河的根本措施是[ ] A、在上游峡谷建水电站 B、在中游搞好黄土高原的水土

She ___________ his number in the phone book to make sure that she had got it right.

A．looked for

B．looked after

C．looked over

D．looked up

She worked deep into the night _____ a long speech for the president. [ ]

A. to prepare

B. preparing

C. prepared

D. being prepared

川产道地药材有（）；（）、川芎、附子、白芷、丹参、川白芍和川牛膝等。

丙氨酸-葡萄糖循环的作用是

A．是氨的转运形式和促进氨基酸转变成糖

B．促进非必需氨基酸的合成

C．促进鸟氨酸循环

D．促进氨基酸转变为脂肪

在JAVA编程中，基于线程的多任务处理环境中，执行特定任务的可执行代码的最小单位是（）。

A.进程

B.线程

C.应用程序

D.服务