[单项选择]Surveys show that（）less sleep than we think,（）too much sleep could even harm our health
A. not only do we need,but that
B. not only we need,but also
C. not only we need, but that
D. not only do we need,but also

[单项选择]Rainforests may store much less carbon than we thought. It could be time to dramatically revise our estimates following the discovery that apparently similar forests hold vastly different amounts of the stuff. The finding is important because there are plans for governments worldwide to compensate tropical countries for protecting their forests as "carbon sinks" to curb global warming. If carbon cannot be counted, then dollars cannot be disbursed (支付).
Greg Asner of the Carnegie Institution for Science in Stanford, California, and colleagues say they used satellite mapping, laser probing of forest undergrowth from aircraft and local ground surveys across a large area of Peruvian rainforest to crack the problem of estimating how much carbon is locked up in forests. But the new technique has revealed a large, previously unknown variability in the density of carbon stored in apparently similar forests.
The Intergovernmental Panel on Climate Change says that there should be about
A. Forests can’t be used as "carbon sinks".
B. Carbon can’t be stored in rainforest.
C. Compensation can’t be distributed.
D. Global warming can’t be curbed.

[单项选择]A. They are less healthy than we expected. B. They are not as natural as we believed.
C. They are not as expensive as before. D. They are more nutritious and delicious.

[单项选择]A. Less than 15 students. B. Less than 10 students.
C. About 20 students. D. About 25 students.

[简答题]S5. From a profit of less than one cent a copy, Webster got most of his income for the rest of his life.

[简答题]I think we use too many electricity at the office.

[单项选择]If k is an integer greater than 44 and less than 51，then which of the following could be the product of 11 and k ？（）
A. 565
B. 550
C. 500
D. 484
E. 440

[简答题]Teachers are paid considerably less than professions that require a simil ar amount of education and skill.

[单项选择]A. Less than three hours. B. More than three hours.
C. Less than four hours. D. More than four hours.

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

[单项选择]How many positive whole numbers less than or equal to 50 are NOT equal to squares of whole numbers
A. 9
B. 15
C. 43
D. 44
E. 45

[简答题]

Write your announcement with no less than 100 words. Write it neatly on ANSWER SHEET 2. Do not sign your own name at the end of the letter; use "Li Ming" instead.
You do not need to write the address. (10 points)

[单项选择]

Carbon dioxide makes up less than one percent of the Earth’s atmosphere. But the gas is very important to life on Earth. Scientists are finding that processes involving carbon dioxide affect our climate in ways that are difficult to understand. Last month, a committee of the National Academy of Sciences in Washington released a report. It confirmed that world temperatures increased about six-tenths of a degree Celsius in the last one hundred years. The report also confirmed evidence that the level of carbon dioxide is increasing.
The best information about climate in the past comes from tests of ice many kilometers deep in Antarctica and Greenland. The tests show changes in temperature during the past four-hundred-thousand years. These tests show that levels of carbon dioxide today are the highest ever measured. These findings have led scientists to believe that carbon dioxide is a major cause of climate warming.
Carbon dioxide is released into the atmospher
A. trees’ function for absorbing carbon dioxide is limited
B. carbon dioxide is the main cause for global warming
C. leaves falling from trees can emit more oxygen
D. more carbon dioxide is beneficial for trees’ growth for many decades