题目内容
15.What makes it rain?Rain falls from clouds for the same reason anything falls to Earth.The Earth's gravity pulls it.But every cloud is made of water droplets or ice crystal(冰晶).Why doesn't rain or snow fall constantly from all clouds?The droplets or ice crystals in clouds are extremely small.The effect of gravity on them is slight.Air currents move and lift droplets so that the net downward amount of water is zero,even though the droplets are moving constantly.It can be seen that droplets and ice crystals behave somewhat like dust in the air in a beam of sunlight.To the casual observer,dust seems to act in a totally random fashion,moving about
without fixed direction.But in fact dust particles(分子) are much larger than water droplets and they finally fall.The average size of a cloud droplet is only 0.0004inch 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 doesn't fall out of moving air at all.Only when the droplet grows to a diameter of 0.008inch or larger can it fall from the cloud.The average raindrop contains a million times as much water as a tiny cloud droplet.The growth of a cloud droplet to a size larger enough to fall out is the cause of rain and other forms of precipitation.This important growth process is called"coalescence".
68.Ice crystals do NOT immediately fall to Earth becauseA.
A.they are kept up by air currents
B.most of them change into steam
C.they combine with other chemicals in the atmosphere
D.their electrical charges draw them away from the earth
69.The underlined word"random"in line 10most probably meansA.
A.unpredictable B.strict C.independent D.abnormal
70.What can be inferred about drops of water larger than 0.008inch in diameter?C
A.They never occur.
B.They are not affected by the force of gravity.
C.In moving air they would fall to earth.
D.In still air they fall a speed of thirty-two miles per hour.
71.How much bigger is the rain drop than a loud droplet?D
A.200times bigger
B.1,000times bigger
C.100,000times bigger
D.1,000,000times bigger.
分析 本文属于说明文阅读,作者通过这篇文章主要向我们描述了雨滴的形成过程和怎样的雨滴才能顺利落到大地上.
解答 68.A.细节理解题,根据第一段The effect of gravity on them is slight.Air currents move and lift droplets so that the net downward amount of water is zero,even though the droplets are moving constantly可知冰晶不会立即掉落到地球,因为他们被气流保持在那儿;故选A.
69.A.词义猜测题.根据第二段To the casual observer,dust seems to act in a totally random fashion,moving about可知对于偶然的观察者来说,尘埃似乎完全是随机的,四处移动;意为难以预料的;故选A.
70.C.细节理解题.根据第三段Only when the droplet grows to a diameter of 0.008inch or larger can it fall from the cloud可知只有当液滴的直径增大到0.008inch或大到可以从云中落下;故选C.
71.D.细节理解题.根据第三段The average raindrop contains a million times as much water as a tiny cloud droplet可知雨点平均含有一百万倍的水的小云滴;故选D.
点评 考察学生的细节理解和推理判断能力,做细节理解题时一定要找到文章中的原句,和题干进行比较,再做出正确的选择.在做推理判断题不要以个人的主观想象代替文章的事实,要根据文章事实进行合乎逻辑的推理判断.
A. | that | B. | one | C. | it | D. | what |
A middle-aged woman took a seat opposite me.She was crying.Not speaking to anyone in particular,she (37)Anarrated her story.
She had come to the city to visit her daughter.On the way to the terminal,a thief had (38)Bone of her bags.It had contained half of the money she'd brought with her.The other half was hidden under her blouse,so she (39)D still had some money left.The bus conductor,driver,and other passengers listened to her tale.
At this time,an old man(40)Agot on the bus.He sat in the seat directly in front of the woman.
After a few minutes,all seats were (41)D.The driver got behind the wheel and started the engine.The bus conductor collected tickets and began asking us where we were(42)C.When he came to the old man's seat,he became (43)B and asked the old man whether he had any money.The old man(44)Cthat he did not.He explained that he (45)Call his money this morning when he'd accidentally got on the wrong bus and now he was trying to go home.
Upon hearing this,the bus conductor (46)Bthe old man to get off the bus.The old man was almost in tears as he begged the bus conductor to let him take that bus (47)A he could get home before dark.The bus driver approached the old man,and repeated the conductor's (48)Bto get off the bus.
"Stop troubling him!Can't you see he's only trying to get home?"she interfered."He doesn't have any money!"the driver shouted."Well,that's no (49)Cto throw him off the bus,"she insisted.
Then she said,"How much is his fare?"The bus conductor mumbled the amount."Fine,"said the woman.She (50)D inside her blouse,took out her (51)D money,and handed the fares to the bus conductor."Here's his fare and mine.Just stop giving him a hard time."
All eyes turned (52)Bthe woman,who,just minutes before,had been crying over the money she'd lost."It's only money,"she shrugged.
By the time the bus rolled out of the terminal,she had given the old man bread and a dollar.She rode the rest of the way home (53)Ba Mona Lisa smile of peace and grace,and the money she'd lost (54)Awas forgotten.
On the road of life,the politeness and smiles of (55)C can lighten our loads and lift our spirits.How much sweeter the journey when we make it a little smoother and richer for others!
36.A.answer | B.agreement | C.indication | D.talk |
37.A.tearfully | B.excitedly | C.helplessly | D.proudly |
38.A.got | B.snatched | C.pulled | D.caught |
39.A.surprisingly | B.peacefully | C.naturally | D.fortunately |
40.A.in rags | B.shyly | C.happily | D.in disorder |
41.A.had | B.taken | C.full | D.crowded |
42.A.getting on | B.getting down | C.getting off | D.getting in |
43.A.conscious | B.suspicious | C.curious | D.anxious |
44.A.realized | B.pretended | C.admitted | D.remembered |
45.A.spend | B.has spent | C.had spent | D.was spent |
46.A.asked | B.ordered | C.led | D.begged |
47.A.so | B.until | C.if | D.when |
48.A.arrangement | B.command | C.advice | D.decision |
49.A.good | B.sense | C.reason | D.doubt |
50.A.picked | B.removed | C.touched | D.reached |
51.A.left | B.saving | C.borrowed | D.remaining |
52.A.in | B.to | C.down | D.on |
53.A.owning | B.wearing | C.hating | D.losing |
54.A.earlier | B.sooner | C.later | D.former |
55.A.customers | B.friends | C.strangers | D.conductors |