题目内容
（请给出正确答案）
More thunderstorms ______ in summer than any other time of the year.
A．happened
B．have happened
C．happen
D．will happen
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更多“More thunderstorms ______ in summer than any other time of the year.A．happenedB．have happe”相关的问题
We know from the text that at Yellowstone_________.
[ A] temperatures can go from o t0 80 degrees
[B] it snows throughout the year except for summer
[C] thunderstorms can be seen throughout the year
[D]it is more windy and rainy illthe spring
From the passage we know ______.
A．the colour of wood or cloth is lighter than that of metal
B．if you stand in a cornfield you'll feel hotter than in a ploughed field
C．when the sunlight is not quite bright light-coloured wood absorbs more heat than dark metal
D．dark things absorb more heat from the sun than others for the same length of time due to their colour, form. and material.
How will the next day's weather compare to the current day's？
A．It will be drier.
B．It will be wetter.
C．It will be cooler.
D．It will be hotter.
Although April did not bring the rains we all hoped for, and although the Central Valley doesn’t generally experience the atmospheric (大气的) sound and lightning that can accompany those rains, it is still important for parents to be able to answer the youthful questions about thunder and lightning.
The reason that these that these two wonders of nature are so difficult for many adults to explain to children is that they are not very well understood by adults themselves. For example, did you know that the lighting we see flashing(闪烁) down to the earth from a cloud is actually flashing up to a cloud from the earth？ Our eyes cheat us into thinking we see a downward motion when it’s actually the other way round. But then, if we believe only what we think we see, we’d still insist that the sun rises in the morning and sets at night.
Most lightning flashes take place inside a cloud, and only a relative few can be seen jumping between two clouds or between the earth and a cloud. But, with about 2,000 thunderstorms taking place above the earth every minute of the day and night, there’s enough activity to produce about 100 lightning strikes on the earth every second.
Parents can use thunder and lightning to help their children learn more about the world around them. When children understand that the light of the lightning flashes reaches their eyes almost at the same moment, but the sound of the thunder takes about 5 seconds to travel just one mile, they can begin to time the interval between the flash and the crash to learn how close they are to the actual spark.
26. According to the first paragraph, in the Central Valley area, rains come _____.
A. when it is April
B. when the field is dry
C. when people all hope for it
D. usually without thunder and lighting
27. We tend to think that lighting moves downward because_____.
A. our eyes play a joke on us
B. we take it to be true scientifically
C. we cannot see it clearly most of the time
D. it always runs down from a cloud to the earth
28. Which of the following is NOT true about lighting according to the passage？
A. Most lightning flashes take place inside a cloud.
B. About 2,000 thunderstorms occur above the earth every minute.
C. People can seldom see lightning flashes running between two clouds or between the earth and a cloud.
D. The thunderstorms happening above the earth can provide enough power to produce about 100 lightning strikes every second.
29. What does the word “ spark” in the last paragraph probably refer to ？
A. Cloud
B. Rain
C. Thunderstorm
D. Lightning flash
30. What does the passage imply？
A. Seeing is believing.
B. We should never trust what we see or hear.
C. People may easily make mistakes in their understanding of nature.
D. Children sometimes know more about nature than their parents do.
So why is it that flying is getting 【23】______ for so many passengers, 【24】______ airlines are spending billions of dollars to improve service, 【25】______ in new equipment such as mobile check-in stations and portable phone banks so travelers can quickly 【26】______ a flight when it is delayed or canceled？ The fact is that air travel has 【27】______ been such an annoyance, and customer complaints to the Transportation Department doubled in 1999 【28】______ 1998.
It seems Mother Nature would 【29】______ people by bus this year. An unusual run of bad weather, 【30】______ long walls of thunderstorms, has crippled airports lately and led to widespread delays and cancellations. After similar problems last summer, the FAA promised to work more closely with airlines 【31】______ weather slowdowns--for example, FAA and airline representatives now gather at a single location in Herndon, Va. , to 【32】______ the best way to allocate the available airspace. But even the FAA 【33】______ the new initiative has fallen 【34】______ of expectations, and many passengers complain that the delays seem 【35】______ .
Part of the problem is overcrowded planes. 【36】______ the strong economy, U.S. airlines are expected to carry a record 665 million passengers this year, up 5 percent from last year. On 【37】______ , planes are about 76 percent full these days, also a 【38】______ . That's good news for the Transport Department, which are profitably loading more passengers 【39】______ each flight, and bad news for passengers, 【40】______ irritations build rapidly in fight quarters.
【21】
A．under
B．below
C．beneath
D．beyond
Volts from the Sky
Lightning has caused awe and wonder since old times. Although Benjamin Franklin demonstrated lightning as an enormous electrical discharge more than 200 years ago, many puzzles still surround this powerful phenomenon.
Lightning is generated when electrical charges separate in rain clouds, though processes'are still not fully understood. Typically, positive charges build at the cloud top, while the bottom becomes negatively charged. In most instances of cloud-to-ground lightning, the negatively charged lower portion of the cloud repels negatively charged particles on the ground's surfaces, making it become positively charged. The positive charge on the ground gathers at elevated points.
A flow of electrons begins between the cloud and earth. When the voltage charge becomes large enough, it breaks through the insulating barrier of air, and electrons zigzag earthward. We see the discharge as lightning.
Lightning can occur within a cloud, between clouds, or between clouds and the ground. 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 percent of lightning discharges, is what we usually see. Lightning comes in several forms, including sheet, ribbon, and ball. Intra-cloud lightning can illuminate a cloud so it looks like a white sheet, hence its name. When cloud-to-ground lightning occurs during strong winds, they can shift the lightning channel sideways, so it looks like a ribbon. The average lightning strike is more than 3 miles long and can travel at a tenth of the speed of light. Ball lightning, the rarest and most mysterious form, derives its name from the small luminous ball
that appears near the impact point, moves horizontally, and lasts for several seconds.
Thunder is generated by the tremendous heat released in a lightning discharge. Temperatures near the discharge can reach as high as 50,000F within thousandths of a second. This sudden heating acts as an explosion, generating shock waves we hear as thunder.
About 2,000 thunderstorms are occurring in the world at any time, generating about 100 lightning strikes every second, or 8 million daily. Within the United States, lightning strikes are estimated at 20 million a year, or about 22,000 per day. You have a 1-in-600,000 chance of being struck by lightning during your lifetime. Lightning can strike twice or more in the same spot. The Empire State Building in New York is struck by lightning about two dozen times annually.
You can measure how far you are from a lightning strike by counting the seconds between viewing the flash and hearing the bang, and then dividing by five. This approximates the mileage.
A. Cloud-to-ground lightening occurring in the US
B. Types of lightening
C. Cause of lightening
D. Differences between thunder and thunderstorm
E. Frequencies of thunderstorms occurring in the world and the US
Paragraphs 2 and 3 ______.
A. Cloud-to-ground lightening occurring in the U. S.
B. Types of lightening
C. Cause of lightening
D. Differences between thunder and thunderstorm
E. Frequencies of thunderstorms occurring in the world and the U. S.
F. Shock waves as thunder
G. Forming process of lightening
Lightning has caused awe and wonder since old times. Although Benjamin Franklin demonstrated lightning as an enormous electrical discharge more than 200 years ago, many puzzles still surround this powerful phenomenon.
41. ______
Lightning is generated when electrical charges separate in rain clouds, though processes are still not fully understood. Typically, positive charges build at the cloud top, while the bottom becomes negatively charged. In most instances of cloud-to-ground lightning, the negatively charged lower portion of the cloud repels negatively charged particles on the ground's surfaces, making it become positively charged. The positive charge on the ground gathers at elevated points.
42.______
A flow of electrons begins between the cloud and earth. When the voltage charge becomes large enough, it breaks through the insulating barrier of air, and electrons zigzag earthward. We see the discharge as lightning.
43. ______
Lightning can occur within a cloud, between clouds, or between clouds and the ground. 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 percent of lightning discharges, is what we usually see. Lightning comes in several forms, including sheet, ribbon, and ball. Intra-cloud lightning can illuminate a cloud so it looks like a white sheet, hence its name. When cloud-to-ground lightning occurs during strong winds, they can shift the lightning channel sideways, so it looks like a ribbon. The average lightning strike is more than 3 miles long and can travel at a tenth of the speed of light. Ball lightning, the rarest and most mysterious form, derives its name from the small luminous ball that appears near the impact point, moves horizontally, and lasts for several seconds.
44. ______
Thunder is generated by the tremendous heat released in a lightning discharge. Temperatures near the discharge can reach as high as 50,000T within thousandths of a second. This sudden heating acts as an explosion, generating shock waves we hear as thunder.
45. ______
About 2,000 thunderstorms are occurring in the world at any time, generating about 100 lightning strikes every second, or 8 million daily. Within the United States, lightning strikes are estimated at 20 million a year, or about 22,000 per day. You have a 1-in-600,000 chance of being struck by lightning during your lifetime. Lightning can strike twice or more in the same spot. The Empire State Building in New York is struck by lightning about two dozen times annually.
You can measure how far you are from a lightning strike by counting the seconds between viewing the flash and hearing the bang, and then dividing by five. This approximates the mileage.
(41)
This is the end of Listening Comprehension.
Section II Use of English
(15 minutes)
Directions :
Read the following text. Choose the best word or phrase for each numbered blank and mark A, B, C or D on ANSWER SHEET1.
Believe it or not, airlines really are trying to do better. They promised to improve customer service last year (21) pressure from a Congress which was (22) stories of nightmare flights.
So why is it that flying is getting (23) for so many passengers, (24) airlines are spending billions of dollars to improve service, (25) in new equipment such as mobile check-in stations and portable phone banks so travelers can quickly (26) a flight when it is delayed or canceled？ The fact is that air travel has (27) been such an annoyance, and customer complaints to the Transportation Department doubled in 1999 (28) 1998.
It seems Mother Nature would (29) people by bus this year. An unusual run of bad weather, (30) long walls of thunderstorms, has crippled airports lately and led to widespread delays and cancellations. After similar problems last summer, the FAA promised to work more closely with airlines (31) weather slowdowns-for example, FAA and airline representatives now gather at a single location in Herndon, Va. , to (32) the best way to allocate the available airspace. But even the FAA (33) the new initiative has fallen (34) of expectations, and many passengers complain that the delays seem (35).
Part of the problem is overcrowded planes. (36) the strong economy, U. S. airlines are ex-pected to carry a record 665 million passengers this year, up 5 percent from last year. on (37), planes are about 76 percent full these days, also a (38)' That's good news for the Transport Department, which are profitably loading more passengers (39 )each flight, and bad news for pas sengers , (40) irritations build rapidly in tight quarters.
21.
[A] under
[B] below
[C] beneath
[D] beyond
A．do
B．hear
C．do them
D．hearing it
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