问题 选择题

下列几种物理现象的解释中,正确的是(  )

A.砸钉子时不用橡皮锤,只是因为橡皮锤太轻

B.跳高时在沙坑里填沙,是为了减小冲力

C.在推车时推不动是因为推力的冲量为零

D.动量相同的两个物体受到相同的制动力的作用,两个物体将同时停下来

答案

BD

橡皮锤与钉子接触时作用时间较长,因而相同动量的情况下作用力较小,A错误;沙坑里填沙,是为增大接触的时间,达到缓冲作用,B正确;推车时推不动是因为推力与所受的摩擦力相等,合力为零,是合外力的冲量为零,而不推力的冲量为零,C错误;根据动量定理:,D正确。

完形填空

阅读理解(共5小题;每小题2分,满分10分)

根据短文内容,从短文后的七个选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

Advertising Everywhere

      1     Now that messages can go around the world at high speed,the world isbecoming smaller and products can be sold everywhere.But it is true that the problems ofinternational advertising—problems of language and culture—have become larger than ever.For example,Braniff Airlines wanted to advertise its fine seals,but when its advertisement wastranslated from English into Spanish,it told people that they could fly without wearing clothes!

To avoid problems in translation,most advertisement firms are now writing completely new ads.In writing new ads,international advertisers must choose different methods of advertising for different countries.In some countries,an advertisement usually gives a description of the product

and explains why it is better than others.      2     But in Japan,the message is based more on situations and feelings than on words.For this reason,many television advertisements broadcast in Japan show people at a party,picnic,or in some other pleasant situations.They will

not say that a product is better than others.Instead,the goal will be to create a good feeling about

the product

        3     For instance,certain countries will not allow TV advertisements on Sundays,and others will not allow them for children’s products on any day.The world advertiser who does

not understand such laws aud customs will soon have problems.

Finally,there is the choice of what to advertise.      4    So the best advertisement in the world means nothing if the product is not suitable for the market.Comparing such as McDonald’s in Hawaii,you will find Chinese food provided on the menu.If you stop at a McDonald’s in Germany,you can order a beer with your meal.

All of these products must be sold with the right kind of message      5     But no matter how difficult this job may be,it is very important for global advenrtisers to do it well.Knowing how to advertise in the world market can help companies for success.

A.People around the world have different likes and dislikes.

B.This is true in the United States,Britain,and Gemany

C.They just show how the product is made

D.In the advertising industry,selling products is the most important goalE.International advertisers must also consider differences in laws and customs

F.It can be explained by a word,a passage,or even a picture

G.It can never be an easy job for advertisers to create message

问答题 简答题