摘要:over zero centigrade零度以上

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完形填空

  Farmer Tom smiles as he looks at his orange trees. The young oranges are growing well in Florida's weather. Warm sunshine and gently rain, along with Tom's 1 , will produce a good crop of oranges this year.

  But Tom has to 2 Florida's changeable winter weather. In 3 , temperature can destroy Tom's entire orange crop. 4 in Florida for the past 35 years, Tom is prepared for the frosts. When temperature drops below freezing, Tom 5 his crop by watering his orange trees. The water 6 a thin layer of ice around the trees. Strange 7 it may sound, this thin layer of ice actually keeps the 8 . What happens is simple. When the trees 9 , the water loses heat and becomes ice. 10 of the heat it loses is sucked in by the fruit and keeps its temperature 11 . Tom has effectively used this method to save many orange crops.

  But Tom still faces some difficulties. The trees should be watered 12 the temperature drops to the freezing point. Also, just the right quantity of water must be used. Too much water can form 13 of ice that will break the trees'branches. 14 difficulty is that wind blows away the heat. So Tom has to worry about not only when but also 15 his trees should be watered, and how much water should be used.

  Computer technology may help Tom 16 . With equipment, air and soil temperatures and wind speed 17 . The information is fed into a computer which can tell when temperature 18 . The computer can correctly decide the quantity of water 19 and how frequently the trees should be watered. Tom will find 20 his orange trees a lot easier with the help of a computer, and will all have the benefits (or advantages) of computer-age oranges.

1.

[  ]

A.expert care
B.special worry
C.particular help
D.private concern

2.

[  ]

A.fight for
B.fight against
C.worry about
D.agree with

3.

[  ]

A.February and March

B.August and September

C.January and February

D.October and November

4.

[  ]

A.Being farmed
B.Having lived
C.Having been kept
D.Having farmed

5.

[  ]

A.tries to save
B.manages to gather
C.hurries to bring in
D.is able to keep

6.

[  ]

A.protects with
B.uses
C.freezes and forms
D.flows and remains

7.

[  ]

A.although
B.as
C.now that
D.as soon as

8.

[  ]

A.tree cold
B.branch good
C.fruit warm
D.roots wet

9.

[  ]

A.will be wet
B.are dry
C.being good
D.are watered

10.

[  ]

A.The warmth
B.The majority
C.The depth
D.A height

11.

[  ]

A.rising
B.at a stage level
C.below freezing
D.over zero

12.

[  ]

A.in a given time
B.during the day
C.at the exact moment
D.at night

13.

[  ]

A.the deeper layer
B.a great deal
C.a lot
D.a thicker layer

14.

[  ]

A.Some
B.Other
C.Another
D.One

15.

[  ]

A.how long
B.how often
C.how many times
D.how soon

16.

[  ]

A.with some of these worries

B.to think about these worries

C.to explain reasons

D.to make a plan

17.

[  ]

A.may be put down
B.must be remembered
C.should be worked out
D.can be measured

18.

[  ]

A.rises
B.falls
C.drops to freezing
D.changes

19.

[  ]

A.to water
B.to be used
C.to be stored
D.to need

20.

[  ]

A.thinking of
B.watering
C.looking after
D.worrying about
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Some time ago, a fellow teacher asked me to be the referee(仲裁人)  on the grading of an exam question. He was about to give a student a    1    for his answer to a physics question, while the student said he should receive a perfect    2   . I read the exam question: “Show how it is possible to    3   the height of a tall building with the    4    of a barometer(气压表) .”

The student had answered: “Take the barometer to the top of the building, fasten a    5  

rope to it,   6    the barometer to the street, and then bring it up,   7    the length of the rope. That’s the    8   .”

I pointed out that the student really have a strong case for full credit(学分) ,since he had answered the question   9    and correctly, but the answer did not prove competence(能力)  in physics. I   10    that the student have another try. I gave the student six minutes, with the   11    that his answer should show some    12   of physics. His answer reads:

“Take the barometer to the top of the building and lean    13    the edge of the roof. Drop the barometer,   14    its fall with a stop watch. Then using the formula s=1/2at2,calculate the height of the building.”

I gave the student    15    full credit.

Before I left, the student said he had   16    answers. “But,” said the student,   17    the best way is to knock at the superintendent’s(管理者)  door. When he    18    ,you say: “Mr. Superintendent, here I have a(n)    19    barometer. If you will tell me the height of the building, I will    20   you this barometer.”

1. A. tick            B. zero             C. mark            D. comment

2. A. score        B. praise             C. reward              D. prize

3. A. change       B. raise             C. determine     D. find

4. A. care         B. aid              C. effort             D. improvement

5. A. strong      B. big              C. beautiful         D. long

6. A. lower        B. drop              C. carry          D. place

7. A. covering     B. folding           C. measuring     D. imagining

8. A. height      B. width                 C. size            D. weight

9. A. perfectly     B. completely         C. seriously          D. carefully

10. A. demanded     B. required          C. insisted        D. suggested

11. A. warning     B. advice            C. order           D. point

12. A. wisdom     B. technology           C. knowledge     D. gift

13. A. on         B. over              C. against          D. beyond

14. A. stopping      B. observing         C. timing         D. watching

15. A. almost     B. still              C. simply          D. hardly

16. A. some          B. other              C. two             D. no

17. A. interestingly   B. surprisingly        C. probably        D. strangely

18. A. opens       B. shouts             C. stares             D. answers

19. A. fine        B. large              C. interesting        D. attractive

20. A. give        B. lend               C. sell           D. show

 

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The year is 2094. It has been announced that a comet (彗星) is heading towards the Earth. Most of it will miss our plant, but two pieces will probably hit the southern half of the Earth.

On 17 July, a piece four kilometers wide enters the Earth’s atmosphere with a massive explosion. About half of the piece is destroyed, but the remaining part hits the South Atlantic at 200 times the speed of sound. The sea boils and a huge hole is made in the sea bed. Huge waves are created and spread outwards from the hole. The wall of water, a kilometer high, rushes towards southern Africa at 800 kilometers an hour. Cities on the African coast are totally destroyed and millions of people are drowned.

Before the waves reach South America, the second piece of the comet lands in Argentina. Earthquakes and volcanoes are set off in the Andes Mountains. The shock waves move north into California and all around the Pacific Ocean. The cities of Los Angeles, San Francisco and Tokyo are completely destroyed by earthquakes. Millions of people in the southern half of the earth are already dead, but the north won’t escape for long. Because of the explosions, the sun is hidden by clouds of dust, and temperatures around the world fall to almost zero. Crops are ruined. The sun won’t be seen again for many years. Wars break out as countries fight for food. A year later, no more than 10 million remain alive.

Could it really happen? In fact, it has already happened more than once in the history of the Earth. The dinosaurs were on the Earth for over 160 million years. Then 65 million years ago they suddenly disappeared. Many scientists believe that the Earth was hit by a piece of object in space. The dinosaurs couldn’t live through the cold climate that followed and they died out. Will we meet the same end?

1.What is mainly described in the passage?

A. A historic discovery.               B. An event of imagination.

C. A research on space.               D. A scientific adventure.

2.A. an earthquake                     B. damages to cities  

C. an Earth explosion                 D. huge waves

3.Why can’t the northern half of the earth escape for long?

A. Because the land is covered with water

B. Because the light and heat from the sun can not reach the earth.

C. Because people there can not live at the temperature of zero.

D. Because wars break out among countries.

4. By giving the example of dinosaurs, the author tries to prove_____________.

A. animals could not live in the cold climate

B. what happened 65 million years ago was an invented story

C. the human beings will die out in 2094  

D. the Earth could be hit by other objects in space

5.We may guess that the writer is ______________.

A. worried        B. practical        C. a scientist       D. full of imagination

 

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