12．If we want to keep fit.we should havea balanced diet．——青夏教育精英家教网—

12．If we want to keep fit，we should havea balanced diet（均衡的饮食）．

11．This year some twenty-three hundred teenagers （ young people aged from 13to 19）from all over the world will spend about ten months in US homes．They will attend US schools，meet US teenagers，and form impressions of the real America．At the same time，about thirteen hundred American teenagers will go to other countries to learn new languages and gain a new understanding of the rest of the world．
Here is a two-way student exchange in action．Fred，nineteen，spent last year in Germany with George's family．In turn，George's son Mike spent a year in Fred's home in America．
Fred，a lively young man，knew little German when he arrived，but after two months'study，the language began to come to him．Schools were completely different from what he had expected-much harder．Students rose respectfully when the teacher entered the room．They took fourteen subjects instead of the six that are usual in the United States．There were almost no outside activities．
Family life，too，was different．The father's word was law，and all activities were around the family rather than the individual（个人）．Fred found the food too simple at first．Also，he missed having a car．
"Back home，you pick up some friends in a car and go out and have a good time．In Germany，you walk，but you soon learn to like it．"
At the same time，In America，Mike，a friendly German boy，was also forming his idea．"I suppose I should criticize（批评） American schools，"he says．"It is far too easy by our level．But I have to say that I like it very much．In Germany we do nothing but study．Here we take part in many outside activities．I think that maybe your schools are better in training for citizens（公民）．There ought to be some middle ground between the two．

29．The world exchange programme is mainly toC．
A．help teenagers in other countries know the real America
B．send students in America to travel in Germany
C．let students learn something about other countries
D．have teenagers learn new languages
30．Fred and Mike agreed thatB．
A．American food tastes better than German food．
B．German schools were harder than American schools
C．Americans and Germans were both friendly
D．There were more cars on the streets in America
31．What is particular in American schools is thatB．
A．there is some middle ground between the two teaching buildings
B．there are a lot of after-school activities
C．students usually take fourteen subjects in all
D．students go outside to enjoy themselves in a car．

10．Solid passes sound very well．Try holding a wooden stick against part of a machine，and place your ears against the stick．The movement of the ball-bearings（滚珠轴承） can be clearly heard．This is a good way of finding the exact source of trouble in a motorcar engine which sounds as if it is wrong and yet gives no information of where the trouble is．
It is probably a good thing that sound cannot travel through a vacuum（真空），for we are thus limited to earth-made sounds．The violent disturbances which are seen sometimes in the sun，for example，may affect our magnetism（磁力） and our radio．They do not affect our ears，which is a very good thing for our peace of mind．
If we have used our eyes and ears，we may have realized that sound takes time to travel through the air．The sound of thunder nearly always follows the lightning flash although they happen at exactly the same time．And the appearance of white cloud above a distant ship or train tells us，before anything is heard，that its whistle has sounded．Just how fast does sound travel through the air？
The speed of sound in the air at ordinary temperature is about 100feet per second，which is about one mile in five seconds or about 700miles per hour．The speed of sound increases slightly with a rise in temperature and falls with a decrease in temperature； it is not affected by the pressure of the air．

24．We never hear anything that happens on the sunA．
A．because of the vacuum between the earth and the sun
B．because we are only used to earth-made sound
C．because of the distance between the earth and the sun
D．because we are likely to enjoy our peace of mind
25．According to the passage，how fast does sound travel through the air at ordinary temperature？C
A．About 700meters per minute．
B．About 1，100miles per hour．
C．About 60，000feet per minute．
D．About one kilometer in five seconds．
26．How do temperature and pressure affect the speed of sound？D
A．The speed of sound increase with a rise in pressure．
B．The speed of sound decrease with a rise in temperature．
C．The speed of sound increase in lower temperature and greater pressure．
D．The speed of sound decreases with a fall in temperature．
27．The underlined sentence in the second paragraph means"D"．
A．thus we can hear anything but the sound made by the earth
B．we can thus hear the sound from both the earth and space
C．thus we can hardly hear any sound because of the limit of the earth
D．thus we can only hear the sound made on the earth，not the sound coming from the outside．

9．假设你叫李华，你的朋友Joan新到你班来学习．她想了解班主任李老师的一些情况．请用100字左右的文章来介绍李老师的情况．内容要点如下：
1李老师年近四十，1986年任教以来，工作一贯努力，曾多次受到表扬
2他知识丰富，教学有方，上课生动有趣，学生爱听他的课．
3他与学生关系融洽，对学生要求严格．经常鼓励大家勤奋学习．在他的帮助之下，大家进步很快．

8．Some Western countries have very exciting carnivals，which take place forty days before Easter，usually in February．

7．We are notpermitted（允许） to swim in the river．It's too dangerous．

6．It d oesn't seem ugly to me； on thecontrary（相反的），I think it's rather beautiful．

5．Experts say eating carrotsbenefits（有益于） your eyes．

4．In the lab，don't touch anything without your teacher'spermission（允许）．

3．When we met again，heapologized（道歉） to me for not having kept his word and asked me to forgive him．

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