In today’s world， sleep experts say that for a better night’s rest， Americans should turn off their smartphones or iPad before sleeping. Such electronic products make the brain more active， and then influence their sleep. But according to a latest survey， more than 90% of Americans regularly use a computer or some other kinds of electronic products in the hour before bed.
Researchers are finding that man-made light from some electronic products at night may reduce the brain chemicals(化学物质) that help sleep. The researchers showed that sitting in the light from computer tablets clearly lowered levels of the chemical which manages our body clocks and plays a role in the sleep cycle.
In the study， the researchers let volunteers read， play games and watch movies on a tablet for different time while measuring(测量) how much light their eyes received. They found that two hours of sitting before a bright tablet screen at night reduced the sleep chemical levels by about 22%.
Studies of students using computers at night have got the similar results. And researchers say that may not only cause sleeplessness， but also raise the risk of obesity(肥胖症)， diabetes(糖尿病) and other diseases.
To be on the safe side， the researchers advise us to use computers less before bed， or at the very least turning down your screen as much as possible.
根据材料内容选择最佳答案。
1.What can we learn from the first paragraph?
A. Americans don’t get enough sleep.
B. Electronic products are very popular.
C. The brain becomes more active at night.
D. Sleep experts never use smartphones.
2.The volunteers in the study did the following things EXCEPT ___________.
A. listening to music
B. playing computer games
C. watching movies
D. reading electronic books
3.How may electronic products influence people’s sleep?
A. Make our brains more active.
B. Make our body weak.
C. Lower our brains’ chemicals that help sleep.
D. Change our body clocks.
4.The underlined word ＂that＂ probably means ___________ in the passage.
A. making a survey about sleep
B. using smartphones in the daytime
C. sitting in a bright room
D. surfing the Internet at night
5.What does the passage tell us to do to have a good sleep?
A. Learn to use smartphones or iPad.
B. Watch some relaxing TV programs.
C. Turn down the screen to the lowest.
D. Try to sleep earlier than before.
Four years ago when I was a boy of 11， I got into the biggest trouble as a kid. It was a Saturday morning. Both my parents were out， leaving me and my 10-month-old sister home alone. Anyway， my sister was still asleep in her room. In fact I had the house to myself. I decided to do some drawing. Soon I gave up. Nothing was on TV， so I felt bored and touched the candles on the shelf …I had an idea! What would happen if I set fire to some kitchen paper? Well， of course it went on fire， but it wasn’t the tiny flame(火苗) I’d expected， and I couldn’t blow it out. I threw it on the floor， and then luckily got my dad’s boots(靴子) and stamped it out.
I thought I was safe until there was a huge hole in my room. When my mum came home later， she smelt the smoke immediately. She dropped the shopping bag， luckily for me， over the hole. I thought this meant she would never see it. However， after running round the house checking for a fire， she of course picked up the bag and saw the hole. Next I was grounded(关禁闭) and in trouble for months. Even worse， the hole was still there， reminding me of what I did.
根据材料内容选择最佳答案。
1. How old was the writer when he wrote the passage?
A. 11 years old. B. 13 years old.
C. 15 years old. D. 17 years old.
2.The underlined words ＂stamp out＂ in the first paragraph mean ___________.
A. 吹灭 B. 扑灭 C. 杀灭 D. 浇灭
3.Put the sentences in the right order according to the passage.
①The boy set fire to some kitchen paper.
②The boy did some drawing.
③The boy was grounded.
④The boy stamped the fire out.
⑤His mother checked for a fire.
A. ②④③①⑤ B. ②①④⑤③ C. ②①④③⑤ D. ①③④②⑤
4.Who put out the fire at last?
A. The writer.
B. The writer and his sister.
C. The writer’s mother.
D. The writer’s father.
5.What’s the main idea of the passage?
A. It’s difficult to put out a fire.
B. The boy didn’t look after his sister.
C. The boy made a big trouble when he was 11.
D. Don’t leave children home alone while shopping.
Have you ever planted a few trees on Tree Planting Day? Each year， millions of people， both ， plant a lot of trees. But this may not be the best way to make your home a place.
Last week we visited a park in Hebei. We were to find most of the trees had been burned. The workers told us that the trees soon after they were planted because they weren’t watered well enough. workers burned them and cleaned the place for trees to be planted this year. a card found in one of the dead trees， a student wrote， ＂I hope this tree will grow up with me to the backbone(栋梁) of our country.＂The workers said that the survival(存活) of the trees was really more important than trees were planted.
Some people in Beijing now have a new idea that they can donate(捐赠) some money and let professionals (专业人士) plant and the trees.
1.A. students and teachers B. old and young
C. boys and girls D. mother and father
2.A. smaller B. colder C. nicer D. larger
3.A. pleased B. happy C. interesting D. surprised
4.A. died B. grew C. bought D. planted
5.A. Though B. When C. Because D. So
6.A. few B. old C. new D. dead
7.A. Over B. From C. On D. About
8.A. need B. hold C. plant D. be
9.A. how many B. when C. how soon D. why
10.A. take out B. take down C. take up D. take care of
—Could you tell me___________?
—Sorry， I don’t know. I will call you when he comes back.
A. when will your brother come back
B. when your brother will come back
C. how your brother will come back
D. how will your brother come back
—What did our science teacher say just now?
—He asked us ___________ more attention ___________ the lab clean.
A. to pay；to keep B. to pay；to keeping
C. pay；to keeping D. pay；to keep
—How long have you ___________ your OPPO R9?
—I bought it last Sunday.
A. buy B. bought C. have D. had
