科学家尚未在太空中发现任何生命。
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现在大多数青少年的运动量都不如过去多。
Most teenagers______________________________________________________
毕业聚会什么时候开始? .
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Though times have changed, falling asleep in class is still quite common among teenagers.
Why do students sometimes fall asleep in class? An obvious(显而易见的) reason is lack(缺少) of sleep. However, there are also causes for getting too little sleep.
Homework is a daily meal for most students, one that can take three to four hours per night. A teenager who wants to be able to take part in any activity besides homework must stay up late to fit everything in. Club activities, sports, computer-game playing, and TV viewing, for example, all lead to teens having less time for both homework and sleep. Sometimes teens lack sleep because of after-school jobs that are taken on to earn extra money for college, family cost, or simply for clothes.
Physical problems are another reason that can cause students to fall asleep in class. For example, insomnia(失眠), which may keep a student up at night, causing exhaustion(疲惫不堪) during class hours, is a serious problem that may require medical attention. Medical research also supports the idea that each person has a body clock that helps to decide his or her sleep pattern. Unluckily, these body clocks do not always work according to school timetables.
The effects of falling asleep in class can be quite serious. First of all, sleeping in class is not a good way to show your respect to teachers. In addition, it is highly possible that other students may make jokes about those who sleep in class. However, the most harmful effect of sleeping in class is missing important points. In the long run, sleepers may end up with failing classes.
Since teens are probably not going to deal with the problem, falling asleep in class will probably remain an all-too-common situation. It will continue until more teens find a way to balance their personal and social lives with school and work, while still finding enough time to sleep.
1.According to the 1st paragraph, what is the common situation among teenagers?
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2.What are the main reasons for this common situation?
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3.Please show us the reasons for teenagers staying up late in Paragraph 3.
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4.Why does the writer talk about “the body clock” in paragraph 4?
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5.According to the 5th paragraph, why shall we avoid the problem?
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6.What can you learn from this passage?
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Daming: Have you ever read the novel War and Peace?
Betty:1.
Daiming: What a pity! It’s a wonderful book.
Betty: Well, I've been waiting to read it for a long time, but I can't get a copy. The library has only three copies. 2.
Daming: Well, 3.If you like, I'll lend it to you.
Betty: Thank you.4.By the way, when can I get it?
Daming:5.Will you please come to my house after school?
Betty: OK. I’ll go as soon as school is over.
A.That's very kind of you.
B.I forgot where I had put it.
C.You really should read it.
D.But they are all out.
E.I’m afraid I haven't.
F.I haven't had it with me.
G.I have a copy of my own!
One cool April 22 morning, people started the day as usual. Yet it was not a normal day. What’s so special about April 22? The answer is because it is Earth Day. People all over the world celebrate this important day. The idea of having a special day to celebrate Earth began in the 1960s. Life was very different then.1. Most people had no idea how dirty our air and water were.
On April 22, 1970, twenty million Americans joined the first Earth Day activities. This showed that people really want to do something for the environment. Since then laws have been passed to protect the air, water, land, and animals. The vehicles (汽车) such as cars and buses you ride in must pass tests to make sure they don't cause too much pollution. Thanks to it, cars today give out about half as many bad chemicals as they did in the past.
2.It's a good thing because they have got a lot of help. The Cuyahoga River in Ohio was so polluted that rubbish and oil on the river even caught fire! Today, the river is cleaner. It no longer burns.3.
Now the celebration has spread to other countries. More than 175 countries take part each year. Every April 22, millions of people get together to clean and protect the Earth. 4. Our job is to put this knowledge to work. You can help keep our planet healthy, too!
A.They also celebrate how far we have come.
B.It's healthy enough for birds, fish, and other animals.
C.As a result, the air we breathe is cleaner than it once was.
D.Few people talked or even thought about the environment.
E.Rivers and lakes are also cleaner today than they were before.
F.Many animals near and in the river come back again after that.
