[简答题]People now sleep about 20% less than they did a century ago. One 2010 poll of 1000 Americans found 36% are drowsy or fall asleep when they are driving, and 29% become very sleepy at work.

[单项选择]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 have no explanation for the findings and do not know if they mean people who like a lie．in(睡懒觉)Can extend their lives by sleeping less． ． 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 1ess than eight hours were far from doing themselves any long—term harm。 “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． Dr．Kripke said．“We don’t know if long sleep periods lead to death．Additional stu
A. Right
B. Wrong
C. Not mentioned

[单项选择]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 have no explanation for the findings and do not know if they mean people who like a lie. in(睡懒觉)Can extend their lives by sleeping less. 16v More than 1.1 million Americans participated in the six-year study.
A. Right
B. Wrong
C. Not mentioned

[填空题]Evaporation from sea water is about 5% less than from fresh water, _________________________(当其他所有条件都相同时).

[单项选择]More than 80 percent of US adults have a less than 10 - percent risk of developing heart disease in the next 10 years, according to a report in the Journal of the American College of Cardiology. Just 3 percent have a risk that exceeds 20 percent.
Only 3 percent of US adults have a more than 10 percent 10 year risk of heart disease.
A. Right
B. Wrong
C. Not mentioned

[填空题]Mr Zidane earns less than Michael Jordan.

[单项选择]How many positive integers less than 20 are equal to the sum of a positive multiple of 3and a positive multiple of 4
A. Two
B. Five
C. Seven
D. Ten
E. Nineteen

[单项选择]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 Amazon.
Amazon is by far the largest remaining rainforest area left on our planet. It’s about 6 to 7 million square kilometers. It’s about two-thirds the size of the United States including Alaska. It’s enormous. Sixty percent of it is in Brazil, but the rainforest also extends into Bolivia, Peru, Ecuador, Colombia, Venezuela, French Guiana and Surinam. And amazingly each year the Amazon provides twenty percent of the world’s fresh water. Here you can find at least 60-70 thousand plant species and at least 3 thousand species of fresh water fish. And more monkeys than you find anywhere else on earth. In Brazil alone nine new species of monkeys have been identified over the last year.
But many of those species, known and unknown, are destroyed every day. Moreover, constant logging,
A. Mining.
B. Constant logging.
C. Raising domestic animals.
D. Producing cars.