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【单选题】
Boeing Co’s Sonic Cruiser, a proposed faster airliner, would be mostly blended material, program director Walt Gillette said recently. In its quest for the (21) to fly 15 to 20 per cent faster than (22) airliners, the US company says about 60 per cent of the new plane’s (23) , including the wing, would be a carbon-fiber-reinforced composite material that is lighter than aluminum for the same (24) . "Composites would (25) almost all of the airplane that you could see from the outside," Gillette said. Composites are well regarded among aeronautical engineers and have been in (26) use since the 1970s. Each generation of planes has more composites, and Gillette (27) that about 10 per cent of Boeing’s (28) civil aircraft, the early-1990s 777, is built (29) the material. (30) still only a proposal, the Sonic Cruiser has (31) the interest of many airlines, which expressed unusual enthusiasm for the aircraft (32) the September 11 attacks forced most of them to scale back operations. When Boeing (33) the Sonic Cruiser last year it said the plane might enter service (34) 2006 and 2008. Gillette said the (35) date now is 2008, by which time the market and technology are expected to have developed (36) Wind-tunnel tests (37) the company’s computer calculations of optimal cruising speed for the plane at 95 to 98 per. cent of the speed of sound. Going faster than sound would use too much fuel and (38) great (39) on the aircraft’s engines. Gillette said the Sonic Cruiser (40) be offered as a family of aircraft with 200 to 250 seats and a range of 6,500 to 9,000 nautical miles (12,000 to 16,700 kilometers).
A.
proficiency
B.
efficiency
C.
affection
D.
effective
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【单选题】The world’s rainforests cover less than ten percent of the earth’s surface, but contain over forty percent of all plant and animal species. The biggest rainforest is in South America, it’s called the ...
A.
the sea
B.
the rainforests
C.
the grassland
D.
E.
D. the desert
【单选题】Insurance Whole life is permanent insurance protection that protects you for your whole life, from the day you purchase the policy until you die, as long as you pay the premiums (保险费). Whole life can...
A.
It’s permanent insurance protection from the day you were born until you die.
B.
It’s permanent insurance protection that protects you for your whole life, from the day you buy it until you die.
C.
It’s insurance protection for your whole family members.
D.
It’s income protection insurance.
【单选题】Calling for Safe Celebrations Last Fourth of July, Pete, a 14-year-old boy, was enjoying the lit-up skies and loud booms from the fireworks(烟花) being set off in his neighborhood. Suddenly, the evening...
A.
About 9,000.
B.
About 4,500.
C.
About 1,350.
D.
About 30.
【单选题】Sleeping People who sleep for more than eight hours a night do not live as long as those who sleep for six hours, according to the biggest study yet into sleep patterns and mortality(死亡率). Scientists...
A.
Although it is a common belief that sleeping for at least eight hours a night is vital for health and well—being. the six. year study involving more than 1. 1 million Americans older than 30 found that those who slept for less than eight hours were far from doing themselves any long—term harm。
B.
"Individuals who now average 6. 5 hours of sleep a night Can be reassured that this is a safe amount of sleep. From a health standpoint。there is no reason to sleep longer," said Daniel Kripke , a professor of psychiatry(精神病学)at the University of California, San Diego.
C.
Dr. Kripke said. "We don’t know if long sleep periods lead to death. Additional studies are needed to determine if setting your alarm clock earlier will actually improve your health. "
D.
The scientists. who were funded by the American Cancer Society, found at the best survival rates were among the men and women who slept for seven hours a night. Those who
E.
slept for eight hours were 12 per cent more likely to die during the six—year period of the study,
F.
when other factors such as diet and smoking were taken into account.
G.
Even those who spent a mere five hours a night in bed lived longer than those who slept eight or more hours. However, an increasing death rate was found among those who slept for less than five hours.
H.
Dr. Kripke said. "Previous sleep studies have indicated that both short-and long-duration(持续时间)sleep had higher mortality rates. However, none of those studies were large enough to distinguish the difference between seven and eight hours a night, until flow. \
【单选题】Sleeping People who sleep for more than eight hours a night do not live as long as those who sleep for six hours, according to the biggest study yet into sleep patterns and mortality(死亡率). Scientists...
A.
Although it is a common belief that sleeping for at least eight hours a night is vital for health and well—being. the six. year study involving more than 1. 1 million Americans older than 30 found that those who slept for less than eight hours were far from doing themselves any long—term harm。
B.
"Individuals who now average 6. 5 hours of sleep a night Can be reassured that this is a safe amount of sleep. From a health standpoint。there is no reason to sleep longer," said Daniel Kripke , a professor of psychiatry(精神病学)at the University of California, San Diego.
C.
Dr. Kripke said. "We don’t know if long sleep periods lead to death. Additional studies are needed to determine if setting your alarm clock earlier will actually improve your health. "
D.
The scientists. who were funded by the American Cancer Society, found at the best survival rates were among the men and women who slept for seven hours a night. Those who
E.
slept for eight hours were 12 per cent more likely to die during the six—year period of the study,
F.
when other factors such as diet and smoking were taken into account.
G.
Even those who spent a mere five hours a night in bed lived longer than those who slept eight or more hours. However, an increasing death rate was found among those who slept for less than five hours.
H.
Dr. Kripke said. "Previous sleep studies have indicated that both short-and long-duration(持续时间)sleep had higher mortality rates. However, none of those studies were large enough to distinguish the difference between seven and eight hours a night, until flow. \
【单选题】The importance and focus of the interview in the work of the print and broadcast journalist is reflected in several books that have been written on the topic. Most of these books, as well as several c...
A.
a news article
B.
a journalistic interview
C.
a research report
D.
a preface
相关题目：
【单选题】The world’s rainforests cover less than ten percent of the earth’s surface, but contain over forty percent of all plant and animal species. The biggest rainforest is in South America, it’s called the ...
A.
the sea
B.
the rainforests
C.
the grassland
D.
E.
D. the desert
【单选题】Insurance Whole life is permanent insurance protection that protects you for your whole life, from the day you purchase the policy until you die, as long as you pay the premiums (保险费). Whole life can...
A.
It’s permanent insurance protection from the day you were born until you die.
B.
It’s permanent insurance protection that protects you for your whole life, from the day you buy it until you die.
C.
It’s insurance protection for your whole family members.
D.
It’s income protection insurance.
【单选题】Calling for Safe Celebrations Last Fourth of July, Pete, a 14-year-old boy, was enjoying the lit-up skies and loud booms from the fireworks(烟花) being set off in his neighborhood. Suddenly, the evening...
A.
About 9,000.
B.
About 4,500.
C.
About 1,350.
D.
About 30.
【单选题】Sleeping People who sleep for more than eight hours a night do not live as long as those who sleep for six hours, according to the biggest study yet into sleep patterns and mortality(死亡率). Scientists...
A.
Although it is a common belief that sleeping for at least eight hours a night is vital for health and well—being. the six. year study involving more than 1. 1 million Americans older than 30 found that those who slept for less than eight hours were far from doing themselves any long—term harm。
B.
"Individuals who now average 6. 5 hours of sleep a night Can be reassured that this is a safe amount of sleep. From a health standpoint。there is no reason to sleep longer," said Daniel Kripke , a professor of psychiatry(精神病学)at the University of California, San Diego.
C.
Dr. Kripke said. "We don’t know if long sleep periods lead to death. Additional studies are needed to determine if setting your alarm clock earlier will actually improve your health. "
D.
The scientists. who were funded by the American Cancer Society, found at the best survival rates were among the men and women who slept for seven hours a night. Those who
E.
slept for eight hours were 12 per cent more likely to die during the six—year period of the study,
F.
when other factors such as diet and smoking were taken into account.
G.
Even those who spent a mere five hours a night in bed lived longer than those who slept eight or more hours. However, an increasing death rate was found among those who slept for less than five hours.
H.
Dr. Kripke said. "Previous sleep studies have indicated that both short-and long-duration(持续时间)sleep had higher mortality rates. However, none of those studies were large enough to distinguish the difference between seven and eight hours a night, until flow. \
【单选题】Sleeping People who sleep for more than eight hours a night do not live as long as those who sleep for six hours, according to the biggest study yet into sleep patterns and mortality(死亡率). Scientists...
A.
Although it is a common belief that sleeping for at least eight hours a night is vital for health and well—being. the six. year study involving more than 1. 1 million Americans older than 30 found that those who slept for less than eight hours were far from doing themselves any long—term harm。
B.
"Individuals who now average 6. 5 hours of sleep a night Can be reassured that this is a safe amount of sleep. From a health standpoint。there is no reason to sleep longer," said Daniel Kripke , a professor of psychiatry(精神病学)at the University of California, San Diego.
C.
Dr. Kripke said. "We don’t know if long sleep periods lead to death. Additional studies are needed to determine if setting your alarm clock earlier will actually improve your health. "
D.
The scientists. who were funded by the American Cancer Society, found at the best survival rates were among the men and women who slept for seven hours a night. Those who
E.
slept for eight hours were 12 per cent more likely to die during the six—year period of the study,
F.
when other factors such as diet and smoking were taken into account.
G.
Even those who spent a mere five hours a night in bed lived longer than those who slept eight or more hours. However, an increasing death rate was found among those who slept for less than five hours.
H.
Dr. Kripke said. "Previous sleep studies have indicated that both short-and long-duration(持续时间)sleep had higher mortality rates. However, none of those studies were large enough to distinguish the difference between seven and eight hours a night, until flow. \
【单选题】The importance and focus of the interview in the work of the print and broadcast journalist is reflected in several books that have been written on the topic. Most of these books, as well as several c...
A.
a news article
B.
a journalistic interview
C.
a research report
D.
a preface
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