Have you ever noticed when your sweat dries it will leave marks on your T-shirt? The marks are tiny bits of salt. If you go to the seaside, you will know that seawater does the same to your clothes, because it also has a lot of salt in it.

Water evaporates from the surface of the sea but the salt remains. Have you ever thought about whether the seas will keep getting saltier? The answer is no. The oceans have stayed at about 3.5 percent salt content for hundreds of millions of years. It keeps a constant level of salt in different ways.

Pick up a seashell and weigh it in your hand. It is heavy. All animals need sodium to live and most need calcium to build bone an shells. The seashell, like all sea animals, gets its sodium and calcium from seawater. When animals die, their salt is locked up in bins and shells, which drop to the bottom of the sea.

Seawater and rocks react with each other not just in one way. Sea salt not only reacts with rocks, but also reacts with the rocks of the ocean crust (壳) and volcanic lava. The reactions take some of the salt in seawater away from the sea.

The outer hard crust of the earth is made up of about a dozen hard plates that drift on very hot, soft rock like floating islands on a sea. The heat within the earth is not the same everywhere and the plates move because of the heat. When an ocean plate knocks into a land plate, the thinner land plate floats over the ocean one. The ocean floor gets pushed under and its salty rocks, shells and bones, are lost deep within Earth.

So, that’s why the seas are salty but don’t get any saltier.

57. What does the underlined word “evaporates” in Paragraph 3 mean?

A. turns into steam　　　　　　　　 B. turns into a solid

C. turns into fresh water　　　　　　　 D. turns into ice

58. From the passage we can know the seashells________.

A. get some minerals from seawater

B. take some salt from sea when seawater reacts with rocks

C. react with rocks of the ocean crust when plates move

D. absorb salt when the plates move

59. How many reasons does the writer mention why the oceans stay at about 3.5％ salt content?

A. 2　　 　　　　　　 B. 3 　　　　　 　　　 C. 4　　 　　　　　　 D. 5

60. What’s the purpose of the author to write the text?

A.　　 Warning　 　　 B. Informing　 　 C. Entertaining　　　 D. Describing

语篇理解

　　Atoms are all around us. They are the bricks of which every thing is made. Many millions of atoms of atoms are contained in just one grain of sand, but despite their small size they are very important. The way in which an everyday object behaves depends on what kinds of atoms are in it and how they act.

　　For instance, you know that most solid objects melt if they get hot enough. Why is this? It is the effect of the heat on the objects' atoms. All atoms move constantly. When they are hot, they move faster.

　　Usually the atoms in an object hold together and give the object its shape. But if the object grows hot, its atoms move so fast that they break the force that usually holds them together. They move out of their usual places so that the object loses its shape. Then we say that the object is melting.

(1)The way in which an object behaves depends on the ______.　

[    ]

A．kids of atoms in it　　 　B．number of atoms in it

C．way its atoms behave　　　D．both a and C

(2)Atoms in an object move ______.

[    ]

A．at all times

B．only when the object is heated

C．whenever they grow hot

D．unless the object has melted

(3)Heating an object will affect　

[    ]

A．the movements of its atoms

B．the speed of its atoms

C．the shape of its atoms

D．both A and B

(4)An object holds its shape because its atoms ______.　

[    ]

A．usually hold together

B．move very fast

C．are very hot

D．are not moving

(5)When its atoms leave their usual places we say that an object is ______.

[    ]

A．shrinking　　　　  　B．expanding

C．changing places　　　D．melting

Are you sometimes a little tired and sleepy in the early afternoon? Many people feel this way after lunch. They may think that eating lunch is the cause of the sleepiness. Or, in summer, they may think it is the heat. However, the real reason lies inside their bodies. At that time – about eight hours after you wake up – your body temperature goes down. This is what makes you slow down and feel sleepy. Scientists have tested sleep habits in experiments where there was no night or day. The people in these experiments almost always followed a similar sleeping pattern. They slept for one long period and then for one short period about eight hours later.
In many parts of the world, people take naps(小睡) in the middle of the day. This is especially true in warmer climates(气候), where the heat makes work difficult in the early afternoon. Researchers are now saying that naps are good for everyone in any climate. A daily nap gives one a more rested body and mind and therefore is good for health in general. In countries where naps are traditional (传统的), people often suffer less from problem such as heart disease.
Many working people, unfortunately, have no time to take naps. Though doctors may advise taking naps, employers do not allow it! If you do have the chance, however, here are a few tips about making the most of your nap. Remember that the best time to take a nap is about eight hours after you get up. A short sleep too late in the day may only make you feel more tired and sleepy afterward. This can also happen if you sleep for too long. If you do not have enough time, try a short nap – even ten minutes of sleep can be helpful.
1. Why do people feel sleepy in the early afternoon according to the text?
   A. They eat too much for lunch.  　　　　 B. They sleep too little at night.
   C. Their body temperature becomes lower.   D. The weather becomes a lot warmer.
2. If you get up at 6:30 am, what is the best time for you to take a nap?
   A. About 12:30 pm.   B. About 1:30 pm.   C. About 2:30 pm   D. About 3:30 pm
3. What would be the best title for the text?
   A. Just for a Rest　　　　　　   　 B. All for a Nap
   C. A Special Sleep Pattern.　　    D. Taking Naps in Warmer Climate.

Peter won’t drive us to the station.He has       to take us all.

A.a very small car　　　　　　　　　B.too small a car

C.a too small car　　　　　　　　　D.such a small car

People do not analyze every problem they meet. Sometimes they try to remember a solution from the last time they had a 36 problem. They often accept the opinions or ideas of other people. Other times they begin to act without 37 ; they try to find a solution by trial and error(反复试验). 　38 , when all of these methods 39 , the person with a problem has to start analyzing. There are six 40 in analyzing a problem.

41 ，the person must recognize that there is a problem. For example, Sam’s bicycle is broken, and he cannot ride it to class as he usually does. Sam must 42 that there is a problem with the bicycle.

Next, the person must find out the problem. Before Sam can repair his bicycle, he must know why it does not work. For example, he must 43 the parts that are wrong.

Now the person must look for 44 that will make the problem clearer and lead to 45 solutions. For example, suppose Sam decides that his bicycle does not work because there is something wrong with the brakes. 　46 , he can look into his bicycle repair book and read about brakes, talk to his friends at the bike shop, or look at his brakes carefully.

After 47 the problem, the person should have 48 suggestions for a possible solution. Take Sam as an example 49 , his suggestions might be: tighten or loosen the brakes; buy new brakes and change the old ones.

In the end, one 50 seems to be the solution to the problem. Sometimes the

51 idea comes quite 52 because the thinker suddenly sees something new or sees something in a different way. Sam, for example, suddenly sees there is a piece of chewing gum (口香糖) stuck to a brake. He 53 hits on the solution to his problem: he must 54 the brake.

Finally the solution is 55 . Sam does it and finds his bicycle works perfectly. In short he has solved the problem.

36. A. serious 　　　　　　 B. usual　　　　　　　　 C. similar　　　　　　　　　　 D. common

37. A. searching　　　　　 B. thinking　　　　　　 C. finding　　　　　　　　　　 D. looking

38. A. Besides　　　　　　　B. Instead　　　　　　　C. Otherwise　　　　　　　 D. However

39. A. fail　　　　　　　　　　 B. work　　　　　　　　 C. change　　　　　　　　　　D. develop

40. A. ways　　　　　　　　　B. conditions　　　　 C. stages　　　　　　　　　　　D. orders

41. A. First　　　　　　　　　 B. Usually　　　　　　 C. In general　　　　　　　　 D. Most importantly

42. A. explain　　　　　　　 B. prove　　　　　　　 C. show　　　　　　　　　　　　D. see

43. A. check　　　　　　　　 B. determine　　　　 C. correct　　　　　　　　　　 D. recover

44. A. answers　　　　　　　B. skills　　　　　　　　 C. explanation　　　　　　 D. information

45. A. possible　　　　　　　 B. exact　　　　　　　　 C. real　　　　　　　　　　　　 D. special

46. A. In other words　　 B. Once in a while C. First of all　　　　　　　D. At this time

47. A. discussing　　　　　　 B. settling down　　　C. comparing with　　　D. studying

48. A. extra　　　　　　　　　　 B. enough　　　　　　　 C. several　　　　　　　　　D. countless

49. A. secondly　　　　　　 B. again　　　　　　　　　 C. also　　　　　　　　　　　D. alone

50. A. suggestion　　　　　　 B. conclusion　　　　　 C. decision　　　　　　　　D. discovery

51. A. next　　　　　　　　　　　B. clear　　　　　　　　　 C. final　　　　　　　　　　　D. new

52. A. unexpectedly　　　　 B. late　　　　　　　　　　 C. clearly　　　　　　　　　D. often

53. A. fortunately　　　　　　 B. easily　　　　　　　　　 C. clearly　　　　　　　　 D. immediately

54. A. clean　　　　　　　　　 B. separate　　　　　　　　C. loosen　　　　　　　　 D. remove

55. A. recorded　　　　　　　B. completed　　　　　　 C. tested　　　　　　　　　 D. accepted