— Waiter!

—___________

—I can't eat this. It's too salty.

A．Yes, sir?　　　 B．What?　　　 C．All right?　　　　 D．Pardon?

阅读下面短文, 掌握其大意, 然后从1-25各题所给的四个选项中, 选出一个最佳答案。

    Three quarters of the world is covered with water. But 1 three percent of this water is fresh. All the 2 is salty.It is the salt 3 sea water useless to 4 . If you take 5 salt away　　 the water can be used for 6 . It is very simple to separate the salt　　 7 the water. You could do it very 8 in your own kitchen.　　 9 some sea water and heat it, 10 it will turn into steam. Catch the steam 　　 11 a plastic bag, or metal container. The steam will cool and 12 back into water. Then taste 13 . You will find that it is no longer salty at all. The salt 14 behind in the 15 container. This way of making fresh water16 salt water is called distilling(蒸馏).

    Here is something else you can try. 17 you have a refrigerator, put　　 18 sea water in it and leave 19 there until part of it turns　　 20 ice. Then melt this ice. You will find 21 the water is quite pure and　　 22 from salt. Seamen 23 went on the first great voyages of discovery in Antarctic 24 their drinking water 25 melting blocks of ice.

    1. A. more　　B. only　　C. because　　D. usually　　 ［　　 ］ 　　2. A. rest　　B. water   C. others　　 D. surface　　 ［　　 ］ 　　3. A. takes   B. forces  C. makes　　  D. has　　　　 ［　　 ］ 　　4. A. him　　 B. the man C. man　　　　D. woman　　   ［　　 ］ 　　5. A. no　　  B. a　　   C. these　　 D. the　　　　  ［　　 ］ 　　6. A. drink   B. drillingC. riding　　 D. driving　　 ［　　 ］ 　　7. A. from　　B. to　　  C. with　　   D.on　　　　   ［　　 ］ 　　8. A. hardly  B. easily  C. slightly   D. difficultly ［　　 ］ 　　9. A. Drink   B. Make　　C. Take　　   D. Take away   ［　　 ］    10. A. in the end  B. in fact  C. because  D.otherwise ［　　 ］    11. A. in　　  B. for　　 C. at　　　　 D. on　　　　  ［　　 ］    12. A. go　　  B.turn　　 C. come　　   D. return　　  ［　　 ］    13. A. the steam　　B. water  C. them　　   D. it　　  ［　　 ］    14. A. have  been  left   B. had been left 　　   C. have  left　　　　 D. had left　　　　　　　　  ［　　 ］    15. A. heating B. heat　　C. cold　　   D. cooling　　 ［　　 ］    16. A. heating B. with　　C. out of　　 D. in spite of ［　　 ］    17. A. But　　 B. If only C. If　　　　 D. Although　　［　　 ］    18. A. some　　B. a　　   C. any　　　　D. they　　　　［　　 ］    19. A. to　　  B. them　　C. the refrigerator D.it　　 ［　　 ］    20. A. at　　  B. with　　C. for　　　　D. to　　　　  ［　　 ］    21. A. that　　B. which   C. when　　   D. why　　　　 ［　　 ］    22. A. free　　B. break away C. made　　D. really　　  ［　　 ］    23. A. they　　B. which   C. who　　　　D. when　　　　［　　 ］    24. A. to get  B. get　　 C. getting　　D. got　　　　 ［　　 ］    25. A. by　　  B. with　　C. to　　　　 D.and　　　　  ［　　 ］

It is natural that children are curious (好奇的) about the world around them. For example, they want to know how their hearts beat. They want to know why the ocean water tastes salty.

　　As children grow up, they become curious about different kinds of things. When they are babies, they are interested in the parts of their bodies and in the smiles of their mothers. They become interested in the physical world around them: the plants, the animals, the sky. Later, they become interested in the things that people have made: wheels, bicycles, cars. And when they are adults, their curiosity continues. Sometimes this curiosity leads to a career (生涯、职业) in science.

　　Scientists spend their lives trying to find out about the world．Those who work with the earth sciences study the earth, the oceans, and the skies. Other scientists who study living things work with the biological sciences. A third group of scientists study the physical sciences, e. g. physics, chemistry .

　　These scientists have already discovered a lot about our world．For example, they tell us why your heart beats fast when you run. They say that when you are quiet, your heart normally beats sixty-five or seventy-five times a minute. Your heart is a pump (泵) that pumps blood to all parts of the body. The blood carries oxygen and nutrition. When you run, your muscles work very hard and use the nutrition that the blood carries to them. The muscles need oxygen, too . So your brain sends a signal to the heart. The signal means that the muscles need more nutrition and oxygen. Then the heart beats fast and sends blood quickly to the muscles. It may beat 90 to 140 times a minute.

　　Of course, scientists cannot answer all of our questions. If we ask, “Why does the ocean water taste salty” scientists will say that the salt comes from rocks. When a rock gets very hot or very cold, it cracks. Rain falls into cracks. The rain then carries the salt into the earth and into the rivers. The rivers carry the salt into the ocean. But then we ask , “What happens to the salt in the ocean? The ocean does not get saltier every year.” Scientists are not sure about the answer to this question.

　　We know a lot about our world, but there are still many answers that we do not have, and we are curious.

1．According to the passage, which of the following statements is true?

　 A．People of different ages are interested in different things

　 B．People in different countries are interested in different things.

　 C．Men and women are curious about different things.

　 D．People are curious in the same way.

2．Scientists who work with the biological sciences study____.

　 A．the earth , the oceans and the sky B．plants and animals

　 C．man-made things　 　　　　　 D．ocean water

3．When you run, your muscles need ____.

A．more nutrition and oxygen 　 B．more signals 　C．more salt D．water

4．A rock cracks _____.

A．in wet regions 　　　 　　　　　　　　B．in dry regions

C．at very high or very low temperatures　 D．when salty water falls in

5．People are always curious because ____.

A．they cannot explain many things 　　B．they know nothing about the world

C．they know little about the world 　 　　D．they want to be scientists

--- Mum, it’s too salty!

--- Really? I ______ too much salt in it.

　　 A. must have put　　 B. must put　　 C. may put　 D. could put