38. They did the       (實驗) in the classroom yesterday.

39. Fanners shouldn’t use too many       (化學品) .They are not good for us.

36. David left his boring job to go on a train       (旅行) .

37. Where is the       (鹽) ？I can’t find it.

      There is little rain in deserts. Because deserts are so dry,they have no “ quilt ” to help stop the soil from going away.As a result,they may get very hot during the day with the sun shining,but don't hold the heat overnight. Many deserts can quickly get cold once the sun goes down. Some deserts can reach temperatures of over 100 degrees F during the day and then drop below freezing (32 degrees F) during the night.

      The largest hot and dry desert in the world is the Sahara Desert in Northern Africa. The Sahara is a sandy desert with great sand hills. It covers over 3 million square miles of Africa.Other large deserts include the Arabian Desert in the Middle East,the Gobi Desert in Northern China and Mongolia,and the Kalahari Desert in Africa.

      Animals that live in the desert are also used to needing little water. Many get all the water they need from the food they eat.Other animals keep water that they can use later.The camel stores up fat in its hump while other animals keep something they need in their tails.

      Only certain types of plants can live in the terrible environment of the desert.You wonH see a lot of tall trees in the desert.Most plants have a way to keep water in their leaves,or trunks so they can live a long time without water.

      Now deserts cover around 20% of the world’s land,but they are growing.This is called desertification and is caused by different reasons including human activities. The Sahara Desert is growing larger and larger each year. What should we do with it?

31. How is the weather during the night in the desert?

   A. Hot. B. Cold. C. Cool.

32. Where does the camel store up fat?

   A. In its hump.

   B. In its stomach.

   C. In its tail.

33. Why won’t we see a lot of tall trees in the desert?

   A. Because of few people there.

   B. Because of the sun shining.

   C. Because of the terrible environment.

34. How much of the land do deserts cover in the world?

   A. One fifth.

   B. Less than 10%.

   C. Two fifths.

35. 1s the Sahara Desert growing or not?

   A. Nobody knows it.

   B. It’s growing.

   C. It’s not growing.

       American researchers have successfully developed a way to clean waste water without chemicals. The technique uses green plants.The tests were carried out at a waste treatment center.The scientists put plants in narrow containers (容器) inside a glass building. One end of each container was a little higher than the other end. Waste water was directed down the container through the plants’ thick roots. The roots absorbed the wastes in the water and used them for food. At the same time the plants produced natural gases. The gases could be collected and sold as fuel (燃料) .

       Four places in Florida have used green plants to clean their waste water.

26. The best title for this passage is       .

   A. The Success of American scientists

   B. A New Way to Treat Waste Water

   C. Waste Water and Green Plants

   D. Advanced Technology in America

27. The technique to clean waste water is based on the fact that       .

   A. green plants can be put in narrow containers

   B. most green plants have thick roots

   C. water can be directed down the container through the plants’ thick roots

   D. the wastes in water are excellent food for plants

28. The technique is called a new way because       .

   A. it is cheaper than any other ways

   B. it can be carried out in a glass building

   C. it makes the waste water clean hut uses no chemicals

   D. it needs only narrow containers and green plants

29. The new technique       .

   A. has come to be widely used in America

   B. is still being tested since its first use

   C. is proved to be more valuable than expected

   D. has come into use in some places of America

30. What is the main idea of this passage?

   A. Green plants are successfully used to clean waste water.

   B. Scientists are able to clean water.

   C. Green plants have been used to clean water in Florida.

   D. New ways of making waste water clean are better than the chemical ones.

      Natural resources are things that we use and they come from the Earth .Our natural resources are limited (有限的) . This means that they will not 16 forever.Some are renewable,like trees. We can plant a new tree when we 17 one down.Others are not renewable,like coal (煤) . When we dig coal out of the 18 and it is used,it is gone.

      People realize the 19 that the Earths natural resources are limited,and that they can do things to help conserve (節(jié)約) those resources. 20 you try to conserve a natural resource,you try to use less of it so it does not get used up so 21 One way that people conserve fuel,like gasoline,is by riding a bicycle or walking when the 22 is short instead of driving.

      Water is a very important natural resource because we all need it to stay 23 We can conserve water 24 making sure that our pipes and taps do not leak (漏) .We can also make 25 choices to conserve water. Everyone can make contributions to protecting natural resources.

16. A. last   B. spread   C. burn   D. change

17. A. turn   B. cut   C. put   D. move

18. A. station   B. building   C. ground   D. brick

19. A. news   B. plan   C. decision   D. fact

20. A. When   B. Although   C. Whatever   D. Whether 

21 .A. slowly   B. hard   C. regularly   D. fast

22. A. money   B. space   C. place   D. distance

23. A. alive   B. alone   C. asleep   D. awake

24. A. about   B. for   C. by   D. with

25. A. generous   B. funny   C. wise   D. surprising

15. What a nice day!We should go sightseeing       watching TV in the hotel.

   A. because of   B. instead of

   C. together with   D. out of

14. John is getting very thin.He doesn’t eat       food.

   A. many   B. enough   C. few   D. little

13. —Do you know the latest information about Flight MH370?

 —I've no idea.Let’s       the TV to watch the news programme.

   A. turn on   B. turn down

   C. turn up   D. turn off

12. The sweet smell of the flowers in the garden comes in       the open window,making us feel in a good mood (心情)

   A. on   B. with   C. through   D. across

11. —You look so tired.

 —My mother makes me       playing the piano for 2 hours every day.

   A. practice   B. to practice

   C. practicing   D. to practicing