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One way of preventing (阻止) floods may be by making rain! This may sound rather 1 . As we know, heavy rain is the 2 of floods, and in Malaysia, most of the 3 are caused by the annual monsoon (一年一度的湿季风), which brings heavy rain to the east coast. If, 4 ,the rain could be made 5 in the South China Sea, there would be 6 floods since the rain could not reach the east coast.
Is it possible to make 7 give up their rain? Yes, it is.
As you probably know, clouds are caused 8 air containing water-vapor (水蒸气). The air rises and, since water-vapor 9 water when it cools, very tiny drops of water are formed. Since these drops are very10 , they float (漂浮) in the air and 11 a cloud. When the cloud rises, however, the drop becomes 12 . Because of this, they 13 together and become big drops. The big drops are no longer able to float because of their 14 , and they fall. As they 15 , they pick up more drops and become bigger. This is the cause of rain.
Rain making 16 making these bigger drops form and fall 17 they would normally do so. This can be done by “seeding” the clouds with chemicals, 18 planting seeds in the ground. Rain can be produced 19 by these chemicals. The seeding is done by 20 which fly through the clouds.
1. A. wonderful B. strange C. interesting D. terrible
2. A. cause B. reason C. way D. means
3. A. rains B. snows C. winds D. floods
4. A. however B. so C. as well D. then
5. A. to rise B. to raise C. to fall D. to drop
6. A. no longer B. no more C. many D. not
7. A. Malaysia B. coast C. clouds D. floods
8. A. of B. by C. with D. for
9. A. changes B. turns C. becomes D. drinks
10 A. big B. small C. wet D. dry
11 A. form B. organize C. meet D. bring
12. A. hotter B. warmer C. lighter D. colder
13. A. appear B. join C. fall D. make
14. A. size B. length C. color D. body
15. A. float B. form C. rise D. fall
16. A. means B. suggests C. show D. needs
17. A. after B. until C. before D. when
18. A. as B. such as C. like D. for
19. A. by the way B. as it C. like it D. in this way
20. A. sowing machines B. tractors
C. farmers D. planes
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An old man had been working for many years for a town. His job was to clear away natural waste from the pool water in the hills, which made up the lovely river flowing through the town nearby. Quietly and 36 , the old man guarded the hills, 37 the leaves and branches, and cleaned up the dirt that would have 38 and polluted the fresh flow of water . The town soon became a popular attraction for tourists. Elegant swans (天鹅) floated along the clear river and the view was so beautiful 39 words.
Years passed. One evening the town 40 met. As they reviewed the budget, one man’s 41 caught sight of the salary 42 being paid to the seldom seen keeper of the river. He asked , “Who is the old man? Why do we 43 to employ him? No one in town ever 44 him. For all we know, the strange keeper of the hills isn’t doing his job. His position isn’t 45 any longer.” Then they voted to 46 the man.
For several weeks, nothing changed….
By early autumn, the trees began to 47 their leaves. Small branches broke off and fell into the pools of the hills, 48 the flow of the shining water. One afternoon, someone noticed a slight yellowish-brown 49 in the river. A few days later, the water was much 50 . Within another week, an oily something covered some sections of the water along the banks, and a terrible 51 was soon sensed. Swans left and so did the 52 . The only thing that was now visiting the village was disease and sickness.
Quickly, the 53 town committee called a special meeting. Realizing their huge error in 54 ,they rehired the old keeper of the river again, and within a few weeks, the river began to clear up. Swans and tourists came back again and new life returned to the small town in the Alps.
Never ignore the seeming smallness of a task, job or life. They may all make a 55 .
36. A. regularly B. suddenly C. naturally D. actually
37. A. cut B. burned C. removed D. selected
38. A. carried B. poured C. changed D. blocked
39. A. beyond B. with C. in D. after
40. A. office B. association C. department D. committee
41. A. eye B. care C. hand D. mind
42. A. list B. form C. figure D. account
43. A. promise B. continue C. stop D. tend
44. A. visits B. hires C. tells D. sees
45. A. powerful B. important C. necessary D. suitable
46. A. find B. fire C. support D. forgot
47. A. lose B. miss C. fall D. grow
48. A. pulling B. speeding C. slowing D. pushing
49. A. fish B. color C. flower D. leaf
50. A. deeper B. cooler C. warmer D. darker
51. A. sound B. smell C. wave D. taste
52. A. managers B. passengers C. villagers D. tourists
53. A. embarrassed B. annoyed C. discouraged D. diappointed
54. A. arrangement B. assignment C. judgement D. amusement
55. A. suggestion B. difference C. progress D. decision
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The Keeper of the River
An old man had been working for many years for a town.His job was to clear away natural waste from the pool water in the hills, which made up the lovely river flowing through the town nearby. Quietly and 36 , the old man guarded the hills, 37 the leaves and branches, and cleaned up the dirt that would have 38 and polluted the fresh flow of water. The town soon became a popular attraction for tourists. Elegant swan(天鹅) floated along the clear river and the view was so beautiful 39 words.
Years passed. One evening the town 40 met. As they reviewed the budget, one man's
41 caught sight of the salary 42 being paid to the seldom seen keeper of the river. He asked, "Who is the old man? Why do we 43 to employ him? No one in town ever 44 him.
For all we know, the strange keeper of the hills isn't doing his job.His position isn't 45 any longer." Then they voted to 46 the man.
For several weeks, nothing changed ...
By early autumn, the trees began to 47 their leaves. Small branches broke off and fell into the pools of the hills, 48 the flow of the shining water. One afternoon, someone noticed a slight yellowish-brown 49 in the river. A few days later, the water was much 50 . Within another week, an oily something covered some sections of the water along the banks, and a terrible
51 was soon sensed. Swans left, and so did the 52 . The only thing that was now visiting the village was disease and sickness.
Quickly , the 53 town committee called a special meeting.Realising their huge error in
54 , they rehired the old keeper of the river again, and within a few weeks, the river began to clear up.Swans and tourists came back again and new life returned to the small town in the Alps.
Never ignore the seeming smallness of a task, job, or life.They may all make a 55 .
36.A.regularly B.suddenly C.naturally D.actually
37.A.cut B.burned C.removed D.selected
38.A.carried B.poured C.changed D.blocked
39.A.beyond B.with C.in D.after
40.A.office B.association C.department D.committee
41.A.eye B.care C.hand D.mind
42.A.list B.form C.figure D.information
43.A.promise B.continue C.stop D.tend
44.A.visits B.hires C.tells D.sees
45.A.powerful B.important C.necessary D.suitable
46.A.find B.fire C.support D.forget
47.A.lose B.miss C.fall D.grow
48.A.pulling B.speeding C.slowing D.pushing
49.A.fish B.color C.flower D.leaf
50.A.deeper B.cooler C.warmer D.darker
51.A.sound B.smell C.wave D.taste
52.A.managers B.passengers C.villagers D.tourists
53.A.embarrassed B.annoyed C.discouraged D.heartbroken
54.A.arrangement B.assignment C.judgement D.amusement
55.A.suggestion B.difference C.progress D.decision
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| Once upon a time, there was an island where all the feelings lived: Happiness, Sadness, Knowledge, and all of the others, including __1__. One day it was announced to the feelings that the island would __2___, so all constructed boats and left, except Love. 1. A. Vanity B. Richness C. Time D. Love 2. A. float B. sink C. fly D. fall 3. A. very B. only C. likely D. first 4. A. advice B. help C. money D. time 5. A. passing by B. looking at C. facing to D. thinking of 6. A. water B. food C. gold D. value 7. A. wealth B. place C. need D. chance 8. A. still B. also C. even D. just 9. A. dirty B. damage C. turn D. steal 10. A. far B. near C. distant D. closed 11. A. joyful B. surprised C. sad D. hurried 12. A. happy B. angry C. amazed D. proud 13. A. saw B. notice C. catch D. hear 14. A. take B. fetch C. ask D. carry 15. A. adviser B. elder C. younger D. helper 16. A. how B. why C. when D. where 17. A. shore B. grass C. land D. room 18. A. Realizing B. Believing C. Understanding D. Questioning 19. A. Kindness B. Time C. Power D. Strength 20. A. cried B. shouted C. smiled D. flushed
|
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阅读下列短文, 从所给的四个选项中, 选出最佳答案。
What makes it rain? Rain falls from clouds for the same reason that anything falls to earth. The earth's gravity(引力)pulls it. But every cloud is made of water droplets(微滴)or ice crystals(结晶). Why doesn't rain or snow fall continuously from all clouds? The droplets or ice crystals in clouds are very small. The effect of gravity on them is tiny.
Droplets and ice crystals act like dust in the air which is made visible in the rays of sunlight. To the careless observer, dust seems to act in a totally disorderly way, moving about freely without fixed direction. But in fact dust particles(微粒)are much larger than water droplets and they finally fall. The cloud droplet of ordinary size is only 1/2500 inch in diameter (直径). It is so small that it would take sixteen hours to fall half a mile in perfectly still air, and it does not fall out of moving air at all. Only when the droplet grows to a diameter of 1/125 inch or larger can it fall from the cloud. The ordinary raindrop has a million times as much water as a tiny cloud droplet. The growth of a cloud droplet to a size large enough to fall out is the cause of rain.
(1) Why don't all ice crystals in clouds immediately fall to earth?
[ ]
A. They are hardly affected by the force of gravity.
B. The earth's gravity keeps them from falling.
C. The clouds prevent them from falling.
D. The heat from the sun's rays makes them turn into steam.
(2) What conclusion can we draw from drops of water larger than 1/120 inch in diameter?
[ ]
A. They fall to the ground slowly.
B. In moving air they fall at a speed of thirty-two miles per hour
C. In still air they would fall to earth.
D. The earth's gravity has no effect on them.
(3) If air kept perfectly still for forty-eight hours, a cloud droplet would fall ________.
[ ]
A. 1/2 miles
B. 3/2 miles
C. 2 miles
D. 5/2 miles
(4) What is the main topic of this passage?
[ ]
A. Types of droplets
B. Droplets and ice crystals
C. How gravity affects clouds
D. The cause of rain
(5) According to the passage, which of the following is not true?
[ ]
A. Cloud droplets can fall to earth as dust particles.
B. Though dust particles are very small, we can see them moving in the rays of sunlight.
C. Cloud droplets don't fall at all in moving air.
D. If a cloud droplet grows to a size large enough, it will fall to earth.
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