Do you know how to study __1__ and make your study more effective （有效的）? We all know that Chinese students usually study very hard for long __2__, This is very good ,but it doesn 't__3__a lot ,for an effective student must
have enough sleep ,enough food and enough rest and __4__. Every day you need to go out for a walk or visit some friends or some nice places. It 's good for your__5__.
When you return __6__your studies, your mind will be refreshed（清醒）and
you ' ll learn more__7__study better. Psychologists （心理学家） __8__ that learning takes place this way. Here take English learning __9__ an example. First you make a lot of progress and you feel happy. Then your language study seems __10__ the same. So you will think you 're learning __11_ and you may give up. This can last for days or even weeks, yet you __12__ give up, and at some point your language study will again take another big __13__. You 'll see that you really have been learning all along. If you get enough sleep, food, rest and exercise, studying, English can be very effective and __14_ . Don ' t give up along the way. Learn __15__ you are sure to get a good result（结果）.
1. A. well
2. A. days
3. A. help
4. A. exercise B. good
B. time
B. give
B. homework
C. better
C. hours
C. make
C. running
D. best
D. weeks
D. take
D. clothes
5. A. health
B. body
C. study
D. life 6. A. after
B. for
C. at
D. to 7. A. yet B. and C. or
D. but 8. A. have found B. have taught Trees are useful in three important w __ .The most important
way is that they provide man with food , wood and other products.
Trees provide food not only for man, but also for animals. W ______________ trees, many animals could not live on the earth. It 's not e ____________ for man to live on the earth, either.
The second important way is that trees give us shade （ 树荫 ）. On a hot summer day, people are eager to have a rest under the shade of a tree after w ________ a long way. You can imagine how important the
shade of a tree is to man and animals.
C. told
D. said
9. A. with B. for C. as
D. to 10. A. to have
11. A. something
C. nothing
12. A. mustn 't
13. A. work
14. A. hard
15. A. slowly B. to make C. to take D. to stay B. anything D. everything B. couldn ' t C. needn 't D. may not B. jump B. common B. fast C. walk C. possible C. quickly D. result D. interesting D. happily
The third important way is that trees help to p ____________ droughts and flood. However, in many parts of the world, man hasn 't realized it.
He has cut trees down in large numbers. In the end, he finds that he has lost the best friends he had.
Our environment is getting w（76）__________ than before. Now more
and more people realize that we should do something to help the
Earth. Here are the things we can do to help the Earth: We can recycle glass, metal and paper. We shouldn 't throw （77 ）t _______ in the garbage can （垃圾箱）! We can （78 ）w ________ instead of driving cars! We should try to （79 ）t ______ short showers and turn off all the （80 ）l _______ and the TV when we leave the room. All of these things will help the Earth.
Do you know Sweden（瑞典）？It l ____ in the north of Europe ．It is the fourth largest country in Europe with an a _______ of 450, 000 square kilometers and
the population of about 8.5 million. Over one third of them live in the three largest cities, namely Stockholm, Goteborg and Malmo. More than half of
Sweden is c _______ with trees. It is one of the r _______ countries in the world.
About 100 years ago Sweden became industrialized（工业化）. Today less than one third of the people are f __________ .
