如图1所示,一只封闭的圆柱形水桶内盛了半桶水(桶的厚度忽略不计),圆柱形水桶的底面直径与母线长相等,现将该水桶水平放置后如图2所示,设图1、图2中水所形成的几何体的表面积分别为S 1、S 2,则S 1与S 2的大小关系是
A:S1=S 2
B:S 1> S 2
C:S 1<S 2
D:S 1与S 2大小关系不确定
下列句子中没有语病的一句是( )
根据句意和汉语注释,写出单词的正确形式。(1)Our English teacher has offered us some useful ____ (建议). I think it will help us a lot in our English study.(2)Here are two ____ (音乐会) tickets for you.(3)Daniel ____ (不愿) to accept my books ,which made me very sad.(4)____ (比较) this new TV set with the old one, you will see which is better.
填空。
①You mustn't walk around during landing. ____ A. On a bus
②You mustn't talk to the driver.____ B. On a train
③You must wear a helmet .____ C. On a bike
④You must wear a seatbelt.____ D. On a car
⑤You mustn't put your head out of the window.____ E. On a plane
⑥You must wear a lifejacket.____ F. On a boat