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______(新技术研制出之后) , the yields as a whole increased by 20 per cent.
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B．having worked out
C．having been worked out
D．to have been worked out
Men and Women Drivers ①Men take more risks. In studies, men as a whole show less careful behavior than women. They drive at higher speeds and closer to other cars. They don't wear seat belts, and drive while drunk more often. They even make riskier turns and take less time when parking. ②But, how someone drives doesn't necessarily equal how well he drives. Men do seem to be more skillful than women at certain driving tasks. However, this slight advantage in ability doesn't turn into better driving records. The kinds of accidents men get into are generally the result of their riskier behavior. According to one study, men are more than three times as likely to be fined for "aggressive driving" than women, and more than 25% as likely to be at fault in an accident. ③Despite the research, it's difficult to decide whether men are truly born better drivers than women. It is also not clear if men are simply more confident in their driving because they're thought to be better, and thus show better skills. Similarly, the traditional view that women are weaker drivers may affect their driving performance. ④Women are catching up, which isn't necessarily good news. Men may be responsible for more accidents than women, but the gap is getting smaller. Today, more women drive and drive more than ever before. Unfortunately, this leads to an increase in speeding, aggressive driving, and even very serious accidents among women. ⑤So, are men better drivers than women？ According to the interesting data from researchers, the answer is yes…and no. Therefore, the tips for both men and women drivers are: learn from the strengths of both sexes, drive confidently and carefully, and don't forget to wear the seat belt. Paragraph①_____.A.Men's driving record
B.Tips for safer driving
C.Men's driving behavior
D.Possible reasons for driving performance
E.Women's driving behavior today
F.Physical differences between drivers
There is no evidence that men are born to be_____.A.better drivers
B.less carefully
C.better skills
D.more risky behavior
E.confidently and carefully
People's traditional view may influence_____.A.better drivers
B.less carefully
C.better skills
D.more risky behavior
E.confidently and carefully
Nowadays women drivers are showing_____.A.better drivers
B.less carefully
C.better skills
D.more risky behavior
E.confidently and carefully
All drivers are suggested to drive_____.A.better drivers
B.less carefully
C.better skills
D.more risky behavior
E.confidently and carefully
F.drivers’ performance
Paragraph③_____.A.Men's driving record
B.Tips for safer driving
C.Men's driving behavior
D.Possible reasons for driving performance
E.Women's driving behavior today
F.Physical differences between drivers
Paragraph②_____.A.Men's driving record
B.Tips for safer driving
C.Men's driving behavior
D.Possible reasons for driving performance
E.Women's driving behavior today
F.Physical differences between drivers
Paragraph④_____.A.Men's driving record
B.Tips for safer driving
C.Men's driving behavior
D.Possible reasons for driving performance
E.Women's driving behavior today
F.Physical differences between drivers
Paragraph⑤_____.A.Men's driving record
B.Tips for safer driving
C.Men's driving behavior
D.Possible reasons for driving performance
E.Women's driving behavior today
F.Physical differences between drivers
Men drivers have poorer records because they drive_____.A.better drivers
B.less carefully
C.better skills
D.more risky behavior
E.confidently and carefully
A．they speak different language
B．they can't keep their traditions
C．most Americans are immigrants
D．their skin color is black
Administers have been aware of the need' to keep parents acquainted with the newer methods used in schools. Many principals have conducted workshops explaining such matters as the reading readiness program, manuscript. writing and developmental mathematics.
Moreover, the classroom teacher, with the permission of the supervisors, can also play an important role in enlightening parents. The informal tea and the many interviews carried on during the year, as well as new ways of reporting pupils' progress, can significantly aid in achieving a harmonious interplay between school and home.
To illustrate, suppose that a father has been drilling Junior in arithmetic processes night after night. In a friendly interview, the teacher can help the parent elevate his natural paternal interest into productive channels. He might be persuaded to let Junior participate in discussing the family budget, buying the food, using a yardstick or measuring up at home, setting the clock, calculating mileage on a trip and engaging in scores of other activities that have a mathematical basis.
If the father follows the advice, it is reasonable to assume that he will soon realize his son is making satisfactory progress in mathematics, and at the same time, enjoying the work.
Too often, however, teachers' conferences with parents are devoted to petty accounts of children's misdemeanors, complaints about laziness and poor work habits, and suggestions for penalties and rewards at home.
What is needed is a more creative approach in which the teacher, as a professional adviser, plants ideas in parents' minds for the best utilization of the many hours that the child spends out of the classroom.
In this way, the school and the home join forces in fostering the fullest development of youngsters' capacities.
The central idea conveyed in the above passage is that______.
A．home training is more important than school training in that a child spends so many hours with parents
B．teachers can and should help parents to understand the objectives of the school
C．parents need to realize how to cooperate with the teachers in educating their children
D．parents have unconsciously hindered and obstructed curricular objectives
A．great anxiety
B．sad illusion
C．ill humor
D．deep hatred
Directions: There are 2 passages in this section. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A, B, C and D. You should decide on the best choice.
The very high temperatures attained in a nuclear explosion result in the formation of an extremely hot intense mass of gas called a fireball. For a l0-kiloton (千吨，核弹当量单位) explosion in the air, the fireball will attain a maximum diameter of about 300m; for a l0-megaton (兆吨，核弹当量单位) weapon the fireball may be 4.8 km across. A flash of heat radiation is emitted from the fireball and spreads out over a large area, but with steadily decreasing intensity. The amount of heat energy received a certain distance from the nuclear explosion depends on the power of the weapon and the state of the atmosphere. If the visibility is poor or the explosion takes place above clouds, the effectiveness of the heat flash is decreased. The heat radiation falling on exposed skin can cause what called flash burns. A 10-kiloton explosion in the air can produce moderate (second-degree) flash burns, which require some medical attention, as far as 2.4 km from ground zero; for a 10-megaton bomb, the corresponding distance would be more than 32 km. milder burns of bare skin would be experienced even farther out. Most ordinary clothing provides protection from the heat radiation, as does almost any opaque (不透明的) object. Flash burns occur only when the bare skin is directly exposed, or if the clothing is too thin to absorb the heat radiation.
The heat radiation can start fires in dry, flammable materials, for example, paper and some fabrics, and such fires may spread if conditions are suitable. The evidence from the A-bomb explosions over Japan indicates that many fires, especially in the area near ground zero, originated from secondary causes, such as electrical short circuits, broken gas lines, and upset furnaces and boilers in industrial plants. The blast damage produced wreckage that helped to maintain the fires and denied access to fire-fighting equipment. Thus, much of the fire damage in Japan was a secondary effect to the blast wave.
Under some conditions, such as existed at Hiroshima but not at Nagasaki, many individual fires can combine to produce a fire storm similar to those that accompany some large forest fires. The heat of the fire causes a strong updraft (向上排气), which produces strong winds drawn in toward the center of the burning area. These winds fan the flame and convert the area into a disaster in which everything flammable is destroyed.
It can be inferred that amount of radiation______.
A．is the greatest when atomic bomb is dropped from the air
B．is the weakest when it spreads over a large area
C．is the greatest when the atomic bomb goes off on the ground
D．becomes increasingly weak as it travels far out
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