The World is in Danger
Our world is in danger. We must do something to protect the environment. But what are the main problems we face?
The greenhouse effect
The atmosphere (大气层) around the Earth is necessary for all living things. It is like the glass of a greenhouse, letting sunlight in and keeping heat from getting out. Without it, the Earth would be the same as the Moon—cold and lifeless.
When we burn fuels (燃料) such as petrol and coal, we produce a gas called carbon dioxide (CO₂). Too much of this gas pollutes the atmosphere, and causes it to keep in too much heat. As a result of the greenhouse effect, the Earth’s temperature is increasing. This causes sea level to rise, and in the future may cause cities to disappear.
Cutting down forests
Every year, we destroy (破坏) nature by cutting down many forests. This makes the greenhouse effect worse because trees take in CO₂ and produce oxygen (O₂). Cutting down trees also destroys the homes of animals that live in forests, and causes the surface of the soil to be easily destroyed by rain. This can result in floods and even more damage (伤害) to the environment.
Bad habits
Many of our habits cause pollution. People often use things once and then throw them away, or leave them on the ground as litter. To protect the environment, we need to take proper action. We should be different from many consumers and become “green consumers”. This means that we should only buy and use products friendly to the environment. We should also recycle as many things as we can. We can reuse things for the same purpose as before, or we can use them for new purposes. Then, we can make a difference.
【小题1】Why is the atmosphere around the Earth necessary for all living things?A.Because the Moon is cold and lifeless. |
B.Because it is like a greenhouse. |
C.Because it lets sunlight in and keeps heat from getting out. |
D.Because with it the Earth is cold and lifeless. |
A.Many seaside cities may disappear. | B.The atmosphere keeps in too much heat. |
C.The Earth’s temperature will rise. | D.The sea level will increase. |
A.People who make friends with green consumers. |
B.People who sell products friendly to the environment. |
C.People who buy products nice to the environment. |
D.People who recycle as many things as they can. |
A.To tell us what to do in the future. |
B.To teach us why and how to protect the environment. |
C.To inspire us how to make a difference. |
D.To encourage us to live in new and different ways in the future. |
“You are just like your mother.” This phrase is often said by many people. As we grow older, we may notice that we’re getting more like our mother. Yet surprisingly, new research has found that most people are more similar to their father.
A team of scientists from the University of North Carolina School of Medicine in the US found that we inherit (继承) equal amounts of genes (基因) from mother and father. But we use more of the DNA we inherit from our father.
The study helps us to partly explain who we are. And more importantly, it helps us to find out whether we are likely to develop illness. For example, if we inherit the gene of a disease from our mother, it may not be as strong as the one we inherit from our father.
“We know that there are 95 genes affected by our parents,” said lead researcher Profesor Fernando Pardo-Manuel de Villena. These are called imprinted genes (印记基因). But now, the study has found that there are thousands of other genes that have come from our parents.
For the study, the scientists selected (挑选) three different species of mice with different genes. The mice then gave birth to nine babies each. When they all reached adulthood, the team then measured (测量) every single gene of their DNA.
They found an imbalance that swung toward their father. Villena also said that the recent study was the first to show that mammals (哺乳动物) are more similar to their fathers than mothers. “This is an unusual new research finding that opens the door to an entirely new area of exploration in human genetics,” he said.
根据材料内容选择最佳答案。【小题1】What’s the main idea of Paragraph 3?
A.We are supposed to be stronger than our parents. |
B.We don’t get the gene of a disease from our mother. |
C.We inherit exactly the same disease from parents. |
D.The finding helps us know possible diseases. |
A.They come from our parents. |
B.They decide when we can develop illness. |
C.They are not as strong as other genes from our parents. |
D.They come from our father. |
A.The mother mice. | B.The baby mice. |
C.The scientists. | D.The imprinted genes. |
A.Imprinted genes |
B.Mice are similar to humans |
C.You are just like your mother |
D.Father’s DNA influences more |
A.On a movie poster. | B.In a medical magazine. |
C.In a travel guide. | D.In a sports magazine. |
Have you ever been told there are things you cannot do because of your gender (性别)? For many girls and women around the world, this happens a lot.
Making the world a better place for girls doesn’t mean that it becomes a worse one for boys.
You could challenge unfair behavior—for example, if you see a girl being excluded (排斥的) or belittled.
A.In fact, the opposite is true. |
B.Everyone should have certain rights. |
C.You can like pink and still fight gender stereotypes. |
D.Or you could start a campaign (活动) to bring about change. |
E.That’s why every year on 8th March, International Women’s Day calls for a more equal world. |
Some countries have a large number of earthquakes. Japan is one of them.
A terrible earthquake happened in Assam, India, in 1986. The land near Shillong suddenly moved 1.5 feet to one side, and then back again.
A.But others do not have many. |
B.Sometimes they break more buildings than the earthquake itself. |
C.It continued to act like this 20 times a minute. |
D.There is often a great noise during an earthquake. |
E.Some people say that earthquakes often happen near volcanoes (火山), but it is not true. |
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