职称英语习题练习

职称英语考试综合类每日一练(2015-12-16)
1题:
The secretary is expected to explore ideas for post-war reconstruction of the area.
A deny B investigate C stress D create
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2、3、4、5、6、7、8、9题:

Volts from the Sky

Lightning has caused awe and wonder since oldtimes. Although Benjamin Franklin demonstrated lightning as enormous electricaldischarge more than 200 years ago many puzzles stillsurround this powerful phenomenon.

Lightning is generated when electrical chargesseparate in rain clouds though processes are still notfully understood. Typically positive charges build atthe cloud top while the bottom becomes negativelycharged. In most instances of cloud-to-ground lightning the negatively charged lower portion of the cloud repels negativelycharged particles on the ground s surfaces making itbecome positively charged. The positive charge on the ground gathers atelevated points.

A flow of electrons begins between the cloud andearth. When the voltage charge becomes large enough itbreaks through the insulating barrier of air andelectrons zigzag earthward. We see the discharge as lightning.

Lightning can occur within a cloud between clouds or between clouds and theground. The first variety intra-cloud lightning is the most frequent but is often hidden from our view.Cloud-to-ground lightning making up about 20 percentof lightning discharges is what we usually see.Lightning comes in several forms including sheetribbon and ball. Intra-cloudlightning can illuminate a cloud so it looks like a white sheet hence its name. When cloud-to-ground lightning occurs during strongwinds they can shift the lightning channel sideways so it looks like a ribbon. The average lightning strike is morethan 3 miles long and can travel at a tenth of the speed of light. Balllightning the rarest and most mysterious form derives its name from the small luminous ball that appears near theimpact point moves horizontally and lasts for several seconds.

Thunder is generated by the tremendous heatreleased in a lightning discharge. Temperatures near the discharge can reach ashigh as 50000°F withinthousandths of a second. This sudden heating acts as an explosion generating shock waves we hear as thunder.

About 2000thunderstorms are occurring in the world at any time generating about 100 light

ing strikes every second or 8 million daily. Within the United States lightning strikes are estimated at 20 million a year or about 22000 per day. You have a1-in-600000 chance of bring struck by lightning duringyour lifetime. Lightning can strike twice or more in the same spot. The EmpireState Building in New York is struck by lightning about two dozen timesannually.

You can measure how far you are from alightning strike by counting the seconds between viewing the flash and hearingthe bang and then dividing by five. This approximatesthe mileage.

练习:1-4题的要求是,从第一个方框的六个选项ABCDEF中选出四个选项为注明的段落各配一个合适的小标题。5-8题的要求是,从第二个方框的六个选项ABCDEF中选出四个选项完成每个句子。

1. Paragraphs 2 and 3

2. Paragraph 4

3. Paragraph 5

4. Paragraph 6

A Cloud-to-ground lightning occurring in theU.S.

B Types of lightning

C Cause of lightning

D Differences between thunder and thunderstorm

E Frequencies of thunderstorms occurring in theworld and the U.S.

F Shock waves as thunder

5. In most cases of cloud-to-ground lightning the ground s surface

6. One form of lightning that is ball lightning

7. Cloud lightning looks like a ribbon when itslighting channel

8. Although not fully understanding processesof lightning man

A occurs most infrequently.

B is shifted sideways by strong winds.

C is often hidden from our view.

D is equipped with a good knowledge of variousforms of lightning .

E is estimated at 20 millions a year.

F is positively charged.

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10题:
He kept in constant contact with his family while he was in Australia
A.gradual
B.direst
C.regular
D.occasional
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11题:
The union representative put across her argument very effectively.
A  explained   B  invented       C  considered       D  accepted
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12题:
John is collaborating with Mary in writing an article
A  cooperating 
B  marrying
C  combining 
D  arguing
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13题:
14  It took US along time to mend the house
A build
B destroy
C design
D repair
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14题:
11 She found me very dull
A  dirty
B  sleepy
C lazy
D  boring
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15题: Accordingly , a number of other methods have been employed
A.Therefore
B.Afterwards
C.However
D.Furthermore
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16题:
This is not typical of English,but is a feature of the Chinese language.
A.particular
B.characteristic
C.remarkable
D.idiomatic
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17题:If you continue to indulge in computer games like this, your future will be at stake.
A.in danger
B.without question
C.on guard
D.at large
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