Doctors say people can do many things to protect themselves from the dangers of extreme（极端的）heat. Stay out of the sun, if possible. Drink lots of cool water. Wear light-colored clothing, and hats made of natural materials（材质）. And make sure the clothing is loose so that you can move freely. 

Most people may feel muscle pain because of heat wave. The pain is a warning that the body is becoming too hot. Doctors say those suffering（苦难） muscle pain should stop all activity and rest in a cool place. They should also drink cool liquids. Doctors suggest us not to do physical activity for a few hours in hot weather.

Hot weather is dangerous for people who weigh too much and have too much body fat, and for people who drink alcohol（酒精）. It also increases dangers for people who must take medicine for high blood pressure（压力）.

A person will lose too much water under the hot weather. He or she will feel weak and very tired. They may have trouble in walking. It may also produce breathing problems and pain in the head, chest or stomach. Doctors say people with such problems should rest quietly in a cool place and drink plenty of water. They also say it may help to wash with cool water.

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1.To keep us from the dangers of extreme heat, doctors ask us not to _________.

A rest in a cool place

B stay in the sun

C drink cool water

D wear light-coloured clothes

解析：选B。B 细节理解题。由第一段的“Stay out of the sun, if possible.”可知在炎热的天气下，我们要尽量避免阳光。故选B。

2.The underlined word “loose” means ________ in Chinese.

A 薄的

B 简单的

C 大方的

D 宽松的

解析：选D。D 猜测词义题。依据本句中的“you can move freely.”可知穿上这衣服能自由活动，说明是要穿宽松的衣服。故选D。

3.From the passage, we know that muscle pain shows _________.

A your body is becoming too hot

B your body is short of water

C you are too nervous

D you are too hungry

解析：选A。A 细节理解题。由第二段中的“Most people may feel muscle pain because of heat wave. The pain is a warning that the body is becoming too hot.”可知肌肉的疼痛表明你的身体太热了。故选A。

4.Hot weather is dangerous for ________.

A people who often exercise

B those fat people

C people who have a stomachache

D people who have a headache

解析：选B。B。细节理解题。由第三段的“ Hot weather is dangerous for people who weigh too much and have too much body fat.”可知炎热天气尤其对胖人危险。

5.What is the best title of the passage?

A Hot Weather and Health

B How to Protect Yourself in Extreme Heat

C How to Exercise in Extreme Heat

D What to Wear in Hot Weather

解析：选B。B。 主旨大意题。细读全文，不难看出本文主要讲了在炎热天气中我们应当怎样做，故选B。