题目内容

When the bell rings, every student takes out an iPad. The light from the screens makes their young faces pretty and lively. That’s what happens every day at my school in the US. We use iPads in class.

I felt surprised and excited when I got an iPad the first day I arrived at the school. But it was not free. I spent about $100 to rent (租) it for three years.

Every iPad at my school has a special learning system (系统) called Focus. Teachers put their teaching materials like textbooks and PPTs on it. When we have classes, we enter the system and download (下载) the materials with our iPads.

It makes the classes interesting and efficient (高效的). For example, a few weeks ago, we learned about London in the UK. Our teacher prepared a video in which we saw many places of interest in London. We could not only watch the video, but also see the words at the same time. Because of the video, I know more about the city.

We also do our homework with iPads. We can know how well we do our homework right after we submit (提交) our homework.

However, there are still some bad points about learning with iPads. Some of my classmates play games or surf the Internet in class.

I believe the key to use iPads well is to have good self-control (自制), isn’t it?

1.In the writer’s class, every student ________.

A.gets a free iPad from the teacher B.plays games on iPads in each class

C.shares an iPad with their classmates in class D.rents an iPad to use at school for three years

2.The underlined word “Focus” is ________.

A.the name of the iPad at school B.PPTs and videos

C.teachers’ teaching materials D.a special learning system

3.According to the example in Paragraph 4, we learn that________.

A.students don’t like to use iPads in class B.iPads are not useful when having classes

C.students use iPads to watch videos every class D.iPads make the classes interesting and efficient

4.What does the writer think of using iPads in school?

A.Students should use iPads as often as possible.

B.To use iPads in school is very bad for students’ eyes.

C.Students should have good self-control when using iPads.

D.All students should use iPads to surf the Internet in class.

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When we exercise hard, we burn fat. But have you ever wondered where exactly the fat goes?

Some doctors think that fat is changed into heat and released in the air. Others think the body burns it. Some even joke that the fat fairy comes and takes it. That is why you always weigh less in the morning.

Now a new study from the University of New South Wales in Australia reveals the mystery. “the correct answer is that most of the mass is breathed out as carbon dioxide(二氧化碳). It goes into thin air,” says the study’s lead author, Ruben Meerman, to Science Daily. Scientists followed the atoms(原子) in 10 kilograms of fat as they are lost. They found that 8.4 of those kilograms are breathed out as carbon dioxide through the lungs. The rest of the weight —1.6 kilograms— becomes water that leaves the body in the form of fluids(液体) such as urine(尿), sweat, breath and tears. “None of this is obvious to people because we can’t see the carbon dioxide gas we breathe out,” said Meerman.

Does that mean you can lose more weight by breathing more? It is not as easy as you think. Breathing more than the body’s metabolic rate(新陈代谢) can make you uncomfortable. You may feel dizzy and become unconscious(无意识的), according the study. So how to lose weight healthily? The key is to eat less and move more. You many have heard this many times.

During a day, a 70kg person breathes out about 200g of carbon dioxide. So if the same person wants to lose weight, he or she can do some light exercise, for example, jogging. This can help lose 240g of carbon dioxide.

1.According to the new study, where does our fat go when we exercise a lot?

A.It is changed into heat and given off in the air. B.The body burns it.

C.The fat fairy comes and takes it. D.Most of it is breathed out as carbon dioxide.

2.What will happen to people if they breathe more than the body’s metabolic rate?

A.They will put on more weight. B.They will feel comfortable.

C.They may become unconscious. D.They may not lose weight at all.

3.Which of the following is a better way to lose weight?

A.Sitting still and breathing more. B.Sleeping a lot and breathing a lot.

C.Eating less and exercising more. D.Eating more and doing some light exercise.

4.Which is true according to the study from University of New South Wales?

A.The fat is changed into heat and released in the air.

B.Most of the kilograms of fat as they are lost are breathed out as carbon dioxide.

C.People can see the carbon dioxide gas we breathe out.

D.If we breathe more than the body’s metabolic rate, we will feel good.

5.During a week , how much carbon dioxide does a 70kg person breathes out?

A.240g B.200g C.1400g D.1680g

There was once a very wide tree in South Africa. 60 people could stand in its hollow trunk(空心树干). The tree reached over 18 meters into the sky and it was more than 1, 100 years old. But recently, that tree and others like it have died.1.

The tree was a baobab(猴面包树). Baobab trees grow in Africa and are called"the Tree of Life”.

Baobab trees usually live a long time. One of the oldest stood for more than 2, 400 years.

2.They noticed that nine of the thirteen oldest baobab trees and five of the six largest died in the following 12 years.

Stephan Woodborne, one of the six scientists, says more research(研究)is needed to know why the trees died.3.That's because the trees clearly weren't sick. Besides, many were in national parks, so they were protected from human activities. They believe that increasing temperatures and changing rainy seasons have made it harder for baobabs to live.

"The big ones and the old ones caught the attention of people, Woodborne says. "But it's not just those. 4.People should be more environment-friendly. It is one way to help protect baobabs and other trees from the effects of climate change, according to Woodborne. 5.

“We need to think about the way we live our lives. "Woodborne says. "If we all change what we do a little bit, it will start to make a difference.”

A.That could mean using less energy(能源) and making less waste(废料), when possible.

B.Smaller and younger baobabs are dying too.

C.However, they think climate change may be the main reason.

D.Scientists are wondering why.

E.In 2005, scientists began a research to find out the age of more than 60 baobabs.

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