早安少女组是哪一年出道？（）A.1997 B.1998 C.1999 D.2000

--- What do you think of the plan ____ at the meeting?

--- Very good. But the most important is to put it into ______.

A．put up, action

B．put forward, practice

C．put aside, practice

D．put away, truth

Millions of trees _____ around our city every year. Our environment is getting better.[ ]

A. are planting      

B. were planted  

C. planted    

D. are planted

工资指导线包括( )。

A．(A) 高线

B．(B) 预警线

C．(C) 低线

D．(D) 基准线

E．(E) 下线

测定水中氯化物的电位滴定法的方法检测下限可达（）mol/LC.L.

生态系统是生态学研究中的______。