摩擦与我们的生活息息相关，假如没有摩擦，下列现象不可能发生的

搜题请搜索小程序“爱下问搜题”

问题选择题

摩擦与我们的生活息息相关，假如没有摩擦，下列现象不可能发生的是[ ]

A、人无法走路

B、火柴头难以划燃

C、老师仍能用粉笔在黑板上写字

D、自行车刹车失灵

答案

答案：C

完形填空

小题1:The man was a________ of frequent theft.

小题2:They greatly increased the sales of their product after it was a____ on TV.

小题3:I feel it is your husband who is to b________ for the spoiled child.

小题4:She worked diligently and as a consequence she was soon _______(提升).

小题5:Many people support the former opinion, but personally I favour the _____ one.

小题6:People who can’t d______ colours are considered to be colour-blind.

小题7:The latest development has further ____(加强) my determination to leave.

小题8:She r______ her sister in appearances. It’s hard to tell one from the other.

小题9:There are v________ goods in the supermarket for people to choose from.

小题10:You don’t seem _______(热情) about the proposal.

选择题

2012年2月新华网报道，加拿大开发出生产医用放射性同位素99 43Tc的简单方法。下列关于99 43Tc的叙述正确的是

A．原子序数是99

B．质量数是43

C．中子数是99

D．电子数是43