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14.解：(1)对小球进行受力分析，小球受重力、细线的拉力和磁铁的吸引力，设细线的拉力和磁铁的吸引力分别为F1和F2。根据平衡条件水平方向有F1sin0=F2sin0(2分)竖直方向有F1cos0+F2cos0=mg(2分)解得F1=F2=6mg。(2分)(2)以小华为研究对象，分析受力情况，受重力Mg、地面的支持力N、静摩擦力∫和小球的吸引力F2,则F2’=F2=6mg(2分)根据平衡条件得f=F2’sinO(1分)N=F2’cosO+Mg(1分)2解得N=Mg+mg,f=(2分)
A young American woman worked in a school in Shanghai． 1. she came to China，she knew little about the Chinese culture of language． One day on her way to school，she went to a bank 2. (draw) some money．To 3. surprise，the bank clerk(职员) asked her if she had had her lunch．She was surprised at such 4. question because in the American culture it would mean that the bank clerk is inviting her to lunch．Between unmarried young people it can also mean the young man’s interest in dating the girl．Since this bank clerk 5. (be) a stranger to the American woman，she was very puzzled(困惑的)，and quickly answered that she had 6. (eat) already．After this she went on to school and was even 7. surprised when one of the teachers asked her the same question．
By now she understood that it could not be an 8. (invite) but was puzzled as to why they asked it．In the following days she was asked the same question again and again and she spent many hours 9. (try) to work out why so many people kept asking her this．At last she thought that these people must be 10. (concern) about her health．She was rather thin at the time，and she thought they must be worrying that she was not eating well!
In fact the question like that has no real meaning at all — it is only a greeting．
试题答案
1.Before
2.to draw
3.her
4.a
5.was
6.eaten
7.more
8.invitation
9.(in )trying
10.concerned
【解析】
试题分析：本文通过一个小故事告诉大家语言存在文化差异。
1.Before.
2.to draw.
3. her surprise,故该空填her.
4.such a question)她很吃惊。故表示填不定冠词a.
5.was.
6. done（表示过去的过去），故该空填eaten.
7.more surprised了。故该空填more.
8.invitation.
9. spend time/money (in) doing sth，故该空应填(in )trying.
10. concerned about：关心；挂念，故该空填concerned.
考点：阅读和基本词汇、句式
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