问题 问答题

坦克有宽宽的履带,可以减小______;磁悬浮列车高速行驶时,车体浮在铁轨上,与铁轨间存在微小的空隙,可以减小甚至消除______.

答案

宽髋的履带,增大了坦克与地面的接触面积,在压力一定的前提下,减小了坦克对地面的压强.

通过同名磁极间的相斥,使车体与铁轨分开,减小了车与铁轨之间的摩擦,可以使车的速度变得更快.

故答案为:压强;摩擦

完形填空

第二卷

第四部分写作(共两节,满分35分)

第一节:对话填空共10小题;每小题1分,满分10分)

M: What are you doing here (76)a_____?                                                 76. __________       

W: Just looking at the lights. I like to look at the city at night.                              

M: Everybody is standing around the piano and singing.

Don’t you want to (77)j_____us?                                                                   77. __________       

W: I’d (78)r_____stay out here for a few minutes.                                        78. __________       

Look down there where I’m pointing.

M: I don’t see anything (79)s_____.                                                             79. __________        

W: That’s (80)w_____I used to live when I was a child.                                 80. __________       

M: What kind of neighborhood was it?

W: A very (81)p_____one. Everybody was supposed to work                          81. __________        

hard and end up with a house in the outer area of the city.

M: But you’ve ended up with a flat in the sky.

W: Yes, and I don’t want to lose it.

M: I think that means that all of us had (82)b______go                                         82. __________       

home soon so that you can get a little (83)s_____.                                        83. __________        

W: I do have to be at the (84)o______in the morning.                                    84. __________       

M: Tell me, how do you do it, both work so hard and play so hard?

W: I don’t know. I just like to do (85b_____. And I don’t need much sleep.            85. __________       

单项选择题