You made the same mistake for ______ third time , dropping _____ “r” in the word “ government” . A. a, the B. a , an C. the , an D a, a
—Do you think the weather is good enough for the picnic? —Yes．You couldn't hope for ____ day at this time of the year． A．a nice B．the nice C．a nic
已知函数，若，则的取值范围为 A. B. C. D.
在光滑的水平面上有a、b两球，其质量分别为 ma、mb，两球在 t 时刻发生正碰，并且在碰撞过程中无机械能损失，两球在碰撞前后的速度图象如图 1-6-6 所
It was a sunny day. A city man was driving along a country road with a new wagon（马车）and a beautiful pair of horses. He didn’t pay a lot of 16 to where he was going. Pretty soon he 17
All the visitors live on floor. A. two B. second C. the second
表皮损坏的蕃茄果实很快就会腐烂，这说明表皮是 ( ) A．机械组织 B．营养组织
Andy never wanted to go to bed on time．His parents had explained to him how important it was to go to bed early and get a good rest．But Andy paid no attention to them，and they didn't know wha
