在平面上确定几何要素的位置，需要两个独立坐标，所以放样划线时每个视图要选取（）基准。

—Amazingly, Zhuo Jun got the first place for the China's Got Talent(中国达人秀) last night. 

—So wonderfully        in the show that he deserved it. [ ]

A. did he perform

B. had he performed

C. he performed

D. he had performed

—The rain came to a stop the night before. The fields are still full of water.        

—It _____ for nearly a week.      [ ]

A. had rained  

B. has rained  

C. would  rain    

D. was raining

下列属于阿德勒个体心理学中重要概念的是（）。

A.力比多

B.集体无意识

C.基本焦虑

D.追求卓越

E.存在感

用于工频整流的（）称为整流管。

A、点接触二极管

B、功率二极管

C、晶体三极管

D、场效应管

水稻光温敏核不育系与三系不育系的主要区别（）。

A.包颈

B.在一定条件下能自交结实繁殖自身

C.分蘖力强

D.开花分散