It’s polite to ________ the person when he or she is talking to you. （注意）
________, I’d like to congratulate all of you who have made progress in the past three years. （首先）
It’s time to say goodbye. I hope I can ________ you in the near future. （收到……来信）
Lots of tourists are amazed at the beauty of the ________ in Yunnan.（蓝天）
根据短文内容，从短文后所给的选项中，选出能填入空白处的最佳选项。选项中有两项为多余选项，并将所选答案涂到答题卡的相应位置上。
Our earth is in trouble. Our drinking water is becoming dirtier, and the air is not as clean as before. People and factories are polluting the air, rivers, lakes and seas. You may think there is nothing you can do to help. That’s not true. 1.
Cars burn oil. 2. Some people believe that too much CO2 is making the earth warmer than ever. 3. This can save some oil and produce less CO2.
4. So turn off the air conditioner(空调) when you don’t need to use it. Use lights that save energy. Use fewer things that cannot be used again. When you buy something, consider those made from things that can be used again first.
A lot of water is needed for a shower. So take shorter showers. 5.
Every small action can make a big difference to our earth. Let’s take action to protect it.
A.This can cut the use of water.
B.Air pollution is very serious.
C.This will make a lot of CO2 into the air.
D.So try to walk, ride a bike or take a bus.
E.Nobody can play a role in protecting the earth.
F.There are many things you can do to save the earth.
G.The biggest energy use at home is for keeping warm or cool.
It might be fun to use your smartphone, but be careful. Too much screen time may be harmful to your health.
First, 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 cause 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 children’s brains. A new study shows that using screens too much can affect（影响） how children’s brains grow. If children use screens for more than one hour a day, they might have lower levels of white matter in their brains. White matter is a key to the development of language and reading skills. So it is wise to cut down the time of children using all kinds of screens.
Third, using screens too much will affect your sleep. According to a study, about 95% of the people between the ages of 13 and 64 use electronics before bed, especially the young people under 20. Doctors say that the light from those electronics at night may make you excited before you go to bed. Then it’s hard for you to get enough sleep. So you’d better turn off smartphones, TVs, and all other screens an hour before your bedtime.
To keep healthy, doctors and researchers strongly advise that you shouldn’t use screens for long hours.
1.The blue light from your screens can cause ________.
A.eyestrain B.headaches C.dry eyes D.all of the above
2.According to the passage, you can’t sleep well because you ________.
A.take a break every 15 minutes B.have lower levels of white matter
C.use screens too much before bed D.are the people from 13 to 64
3.Which of the following is NOT true according to the passage?
A.Using smartphones for long hours does harm to your eyes.
B.A lot of screen time affects children’s brain growth.
C.The light from electronics at night may make you excited.
D.People of all ages mustn’t use electronics.
4.You may read the passage in ________.
A.a science magazine B.a travel diary C.a guide book D.a novel
5.What is the main idea of the passage?
A.The ways to keep healthy. B.The harm of using screens too much.
C.The ways to use screens. D.The advantages of using screens.
