Natural resources (自然资源) are things that we use that come from Earth. Our natural resources are limited. This means that they will not _________ forever. Some are renewable (可再生的), like when you plant a new tree when you _________ one down. Others are not renewable, like when you dig coal out of the _______. Once it is used, it is gone.

People realize the ________ that Earth’s natural resources are limited, and can do things to help conserve (节约) those resources. _________ you try to conserve a natural resource, you try to use less of it, so it does not get used up so __________. One way that people conserve fuel, like gasoline, is by riding a bicycle or walking when the __________ is short instead of driving everywhere.

Water is a very important natural resource because we all need it to stay _________. We can conserve water ___________ making sure that our pipes and taps do not leak (漏). We can also make _________ choices to conserve water, like only using the dishwasher or washing machine when they are full. Eevryone can make contributions to protecting natural resources.

Natural resources (自然资源) are things that we use that come from Earth. Our natural resources are limited. This means that they will not _________ forever. Some are renewable (可再生的), like when you plant a new tree when you _________ one down. Others are not renewable, like when you dig coal out of the _______. Once it is used, it is gone.

People realize the ________ that Earth’s natural resources are limited, and can do things to help conserve (节约) those resources. _________ you try to conserve a natural resource, you try to use less of it, so it does not get used up so __________. One way that people conserve fuel, like gasoline, is by riding a bicycle or walking when the __________ is short instead of driving everywhere.

Water is a very important natural resource because we all need it to stay _________. We can conserve water ___________ making sure that our pipes and taps do not leak (漏). We can also make _________ choices to conserve water, like only using the dishwasher or washing machine when they are full. Eevryone can make contributions to protecting natural resources.

【推荐1】You either have it, or you don’t—a sense of direction, that is. But why is it that some people could find their way across the Sahara without a map, while others can _______ themselves in the next street?

Scientists say we’re all born with a sense of direction, but it is not _______ understood how it works. One theory is that people with a good sense of direction have simply worked harder at _______ it. Research being _______ out at Liverpool University supports this idea and suggests that if we don’t use it, we lose it.

“Children as young as seven have the ability to find their way around.” says Jim Marttand, Research Director of the project. “However, if they are not allowed out alone or are taken everywhere by car, they never develop the skills.” Jim Martland also emphasizes that young people should be taught certain _______ to improve their sense of direction. He makes the following suggestions:

If you are using a map, _______ it so it relates to the way you are facing.

If you leave your bike in a strange place, put it near something like a big stone or a tree. Note landmarks on the route as you go away from your bike. When you return, go back along the same route.

Simplify the way of finding your direction by using lines such as streets in a town, streams, or walls in the countryside to _______ you. _______ your steps so that you know how far you have gone and note any landmarks such as tower blocks or hills which can help to find out where you are. Now you need never get lost again!

It might be fun to use your smartphone (智能手机). But be careful because too much screen time may be _______ to your health.

_______, it is bad for your eyes. A researcher called Sarah Hinkley says the problem comes from the blue light that the screen gives out. Looking at a smartphone for a long time can _______ eye strain (劳损), headaches and dry eyes. So it is a good idea to take a break every 15 minutes when you are working at a computer or using a smartphone.

Second, screen use can do harm to _______ brains. A new study shows that using screens too much can affect how children’s brains grow. If children use screens for more than one hour a day, they might have lower levels of white matter (白质) in their brains. White matter is a key to the development of language and reading skills. So it is wise to _______ the time of children using all kinds of screens.

Third, using screens too much will affect your sleep. _______ a study, about 95% of the people aged 13 to 64 use electronic products before going to bed, especially the young people under 20. Doctors _______ that the light from those electronic products at night may make you excited before you go to bed. Then it is hard for you to fall asleep. _______ you’d better turn off smartphones, TVs, and all other electronic products an hour before your _______.

To keep healthy, doctors and researchers strongly advise that you shouldn’t use screens for long hours. Do you know ________ now?