[单项选择]

What makes one person more intelligent than another What makes one person a genius, like the brilliant Albert Einstein, and another person a foolAre people born intelligent or stupid, or is intelligence the result of where and how you liveThese are very old questions and the answers to them are still not clear.
We know, however, that just being born with a good mind is not enough. In some ways, the mind is like a leg or an arm muscle(肌肉). It needs exercise. Mental(done with the mind)exercise is particularly important for young children. Many child psychologists (心理学家)think that parents should play with their children more often and give them problems to think about. The children are then more likely to grow up bright and intelligent. If, on the other hand, children are left alone a great deal with nothing to do, they are more likely to become dull and unintelligent.
Parents should also be careful with what they say to young children. According to some psychologist
A. Born with a good mind.
B. Body exercise.
C. Mental exercise.
D. Muscle.

[单项选择]

What makes one person more intelligent than another What makes one person a genius, like the brilliant Albert Einstein, and another person a foolAre people born intelligent or stupid, or is intelligence the result of where and how you liveThese are very old questions and the answers to them are still not clear.
We know, however, that just being born with a good mind is not enough. In some ways, the mind is like a leg or an arm muscle(肌肉). It needs exercise. Mental(done with the mind)exercise is particularly important for young children. Many child psychologists (心理学家)think that parents should play with their children more often and give them problems to think about. The children are then more likely to grow up bright and intelligent. If, on the other hand, children are left alone a great deal with nothing to do, they are more likely to become dull and unintelligent.
Parents should also be careful with what they say to young children. According to some psychologist
A. Great.
B. Handsome.
C. Clever.
D. Busy.

[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 atmosphere when fuel is
A. A．7) can be replaced by ______. organB. topicC. publicationD. result