Autumn and winter are cold and flu seasons. Will the old advice about dressing warmly help prevent a cold, or if you get sick, should you follow the old saying, “feed a cold and starve a fever?” And what about that fever? Should you take medicine to reduce your temperature, or is it better to let the body treat the fever itself? Everyone seems to have an answer. But is popular wisdom valuable?
Doctor Nelson knows a lot about cold and flu seasons. Nelson says research may be just starting to provide proofs for long-held beliefs. For example, scientists for years were against the idea that getting cold and wet might cause colds or flu. But recent studies have shown that cold temperatures cause stress on the body, and that stress can create conditions more inviting to viruses. So maybe it does make sense to wrap up warmly before going outside.
And what about feeding a cold and starving a fever? Nelson says if you have a cold and are hungry, you should eat. But a fever, especially a high one, suggests a more serious problem. He says people are usually not hungry when they have a high fever. Eating might even make a person sick. But drinking enough water is important. A fever easily makes the body lose water.
Finally, when should you treat a fever? Nelson says a fever should be treated if it stays at
40℃ or above for a day or more. A high temperature can damage brain cells. The doctor also believes in treating a fever if it prevents a person from sleeping.
Medicine like aspirin, for example, can be used to reduce pain and fever. But aspirin should not be given to children because it can cause serious problems.
We can learn from the passage that Doctor Nelson________.

A．doesn’t believe in the old advice about preventing colds

B．is now trying his best to provide proofs for long-held beliefs.

C．doesn’t think it necessary to see a doctor immediately if a person has a temperature of 40℃

D．doesn’t think it necessary to treat a fever even if it prevents someone from sleeping.

According to Doctor Nelson, if someone catches a fever, he should________.

A．bathe in cold water	B．drink enough water
C．try to eat something	D．take some exercise outside

Which of the following is Not mentioned in the passage?

A．When people should treat a fever

B．Whether the old advice about preventing a cold is valuable.

C．What the medicine , aspirin, is used for.

D．Why people should eat when having a cold.

The passage suggests that_______.

A．aspirin can damage train cells if an adult takes too much of it.

B．it is easier for people to catch colds when their bodies are stressed.

C．some old advice about preventing colds doesn’t make any sense.

D．the idea that getting cold can cause flu was proved true years ago.