[单项选择]

If you’re among the 24 million Americans who work from dusk to dawn, don’t underestimate the physical and emotional costs of punching the clock in the dark.
Compared with day workers, night workers are five times more likely to get stomach diseases, twice as likely to smoke cigarettes or use stimulants, and at higher risk for high blood pressure, heart. attack, and breast cancer. And if you have kids, your divorce risk is three to six times higher than normal.
"You’re out of sync with everything and everybody," says Acacia Aguirre, MD, PhD, author of an eye-opening new report. Your biological clock is thrown off, too. How to survive: "A healthy lifestyle matters even more," Aguirre says. "Exercise, limit coffee, and fit in 7 to 8 hours of sleep per day./

What does it mean by "punching the clock" (Line 2, Para.1)（　）.
A. Working.
B. Striking.
C. Repairing.
D. Sleeping.

[单项选择]

If you’re among the 24 million Americans who work from dusk to dawn, don’t underestimate the physical and emotional costs of punching the clock in the dark.
Compared with day workers, night workers are five times more likely to get stomach diseases, twice as likely to smoke cigarettes or use stimulants, and at higher risk for high blood pressure, heart. attack, and breast cancer. And if you have kids, your divorce risk is three to six times higher than normal.
"You’re out of sync with everything and everybody," says Acacia Aguirre, MD, PhD, author of an eye-opening new report. Your biological clock is thrown off, too. How to survive: "A healthy lifestyle matters even more," Aguirre says. "Exercise, limit coffee, and fit in 7 to 8 hours of sleep per day./

According to the text, night workers are more likely to （　）.
A. suffer stomach trouble
B. neglect kids
C. be bad-tempered
D. get out of control

[单项选择]If you’re like 67% of Americans, you’re currently overweight or obese. If you’re like 27%, your blood pressure is too high. If you’re like a whopping 96% of the population, you may not be able to recall the last time you had a salad, since you’re one of the hundreds of millions of Americans who rarely eat enough vegetables. And what you do eat, you don’t burn off - assuming you’re like the 40% of US who get no exercise. Most troubling of all, if you’re like any parent of any child anywhere in the world, you may be passing your health habits to your children, which explains why experts fear that this generation of American kids may be the first ever to have a shorter life span than their parents do.
What is the percentage of Americans who do not do physical exercise,9
A. 67%
B. 27%
C. 96%
D. 40%

[单项选择]Of the 1, 200 million people who call themselves Chinese,（）a very small number speak what is referred to as standard Chinese.
A. none but
B. but for
C. all but
D. but then

[单项选择] Americans smoke six thousand million cigarettes every year (1970 figures). This is roughly the equivalent of 4,195 cigarettes a year for every person in the country of 18 years of age or more. It is estimated that 51% of American men smoke compared with 340,6 of American women. Since 1939, numerous scientific studies have been conducted to determine whether smoking is a health hazard. The trend of the evidence has been consisted and indicates that there is a serious health risk. Research teams have conducted studies that show beyond all reasonable doubt that tobacco smoking particularly cigarette smoking is associated with a shortened life expectancy. Cigarette smoking is believed by most research workers in this field to be an important factor in the development of cancer of the lungs and cancer of the throat and is believed to be related to cancer of the bladder and the oral cavity. Male cigarette smokers have a higher death rate from heart disease than non- smoking males.
A. twice as many as women smokers
B. two times as many as women smokers
C. 1.5 times as many as women smokers
D. seventeen percent less than women smokers

[填空题]The Americans who acquire their political education immediately they get the fight to vote at the age of 21 are __________________ in the world.

[单项选择]Tomorrow evening about 20 million Americans will be shown, on their television screens, how easy it is to steal plutonium (钚) and produce "the most terrifying blackmail weapon ever devised" -- a homemade atomic bomb.
They will be told that no commercial nuclear plant in the United States -- and probably in the world -- is adequately protected against a well planned armed attack by terrorists, and that there is enough information on public record to guide a nuclear thief not only to the underground rooms of nuclear plants where plutonium is stored, but also to tell him how the doors of those underground rooms are designed.
The hour-long television programme, "The Plutonium Connection", makes its point by showing how a 20-year,old student of the Massachusetts Institute of Technology in five weeks designed an atomic bomb composed of plutonium and parts from a hardware atom.
The young man, whose identity is Being kept secret for fear he may be kidnapped by terrorists, is quo