How do animals live in the cold winter? They do many different, amazing things to get through the winter. Some of them “migrate”. This means they travel to other places in autumn where the weather is warmer or they can find food. Some fly in large groups, because the trip can be dangerous. Other kinds of birds fly alone. Some animals remain active in winter. They must make changes to adapt to(适应) the changing weather. Animals may grow new, thicker fur in autumn so that they can keep warm.

Sometimes, you might not finish drinking your glass of water before you go to bed. You might want to drink it the next morning. 【小题1】 “If you have clean water in a clean glass, you’re fine to drink it for a day or two,” says Kellogg Schwab, a professor of water in public health at Johns Hopkins Bloomberg School of Public Health.

【小题2】 That’s because after about 12 hours, the carbon dioxide in the air reacts(反应) with the water in your glass, slightly lowering its PH level.

Also, there might be more microorganisms(微生物) in your water if you leave it out over night. 【小题3】 They can stick to your glass and make you get sick more easily. But as long as you clean your glass very often, this will not be a problem.

In countries like the US and the UK, people often drink water directly from the tap. This is OK.

【小题4】 It has a shelf life(保存期) of six months. After six months, the bacteria(细菌) in the water start to grow. You’d better not drink it.

【小题5】 Schwab said people should be careful when drinking it. If you leave a bottle of water under the sun or in a car for a long period of time, the plastic produces a chemical called BPA, which can cause heart disease and cancer.

Many workers have burnout (过度劳累). The World Health Organization (WHO) says burnout is a medical problem.

People have burnout because they have too much stress. People with burnout always feel very tired when they do their jobs. They don’t have any energy when they are at work. They feel negative about their jobs. They are not confident about their jobs. Lots of them want to give up their jobs. They want to run away from their jobs.

The WHO advises doctors to pay attention to burnout because it is a medical problem. The WHO says they should treat patients for burnout. The number of people with burnout is going up quickly because more and more people have too much stress about their jobs.

Burnout was found in 1974. Researchers say it can come from depression (沮丧). Burn-out causes some ______, like heart disease, high blood pressure and diabetes (糖尿病).

It’s true that some people have burnout. What should they do? Some health experts advise people with burnout to talk to their boss, co-workers, family and friends. They should do something to make themselves relaxed. For example, they should do some outdoor activities like going for a walk.