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The earth is a special planet in the solar system. The explosion of the earth produced carbon, nitrogen, vapor and other gases, ________1.________ (make) the earth’s atmosphere. What is even more important is _2.________as the earth cooled, water which is fundamental to the________3.________（develop） of life appeared and stayed on the surface. The continued presence of water allowed the earth to dissolve ________4.(harm) gases into the oceans and this produced a chain reaction which made it possible for life to develop.
Many millions of years later, the _5.________（arrive） of small plants encouraged the development of early shellfish ________6.________ all sorts of fish. Then, with the first green plants appearing on land, land animals appeared and dinosaurs developed and existed on the earth for millions of years. Then Dinosaurs’ sudden disappearance made the rise of mammals possible on the earth. They were different from all life forms ________7.________ ever existed in the past because they produced young from within their bodies. Finally, some small clever animals with hands and legs ___8.___(appear) and spread all over the earth. Thus they, in their turn, have become ________9.________ most important animals. However, they are putting too much carbon dioxide into the atmosphere. So for millions of years to come, ________10.________ life will continue on the earth will depend on whether the present problem can be solved.
难度: 中等查看答案及解析
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Plants are very important living things. Life could not go on if there were no plants. This is because plants can make food from air， water and sunlight. Animals and man cannot make food from air， water and sunlight. Animals get their food by eating plants and other animals. Therefore animals and man need plants in order to live. This is why we find that there are so many plants around us. If you look carefully at the plants around you， you will find that there are two kinds of plants： flowering plants and non-flowering plants. Flowering plants can make seeds. The seeds are protected by the fruits. Some fruits have one seed， some have two， three or four， and some have many seeds. But a few fruits have no seeds at all. An example of a fruit without seeds is the banana fruit. Most non-flowering plants do not grow from seeds. They grow from spores（胚芽）。 Spores are very small. Some spores are so small and light that they can float in the air. We may say that spores are quite the same as seeds. When these spores are all on wet and shady places， they usually grow into new plants.
1.The main idea of the first paragraph is that ______.
A．plants are important for life B．plants cannot grow without air
C．there are many plants in the world D．we can not live without water
2.Plants can make food from ______.
A．flower， water and air B．water， sunlight and air
C．air， water and soil D．air， sun and light
3.What can we infer（推断） from the passage ？
A．Of all living things animals are most important
B．Spores are seeds
C．All fruits of flowering plants have seeds
D．Without plants， man will die out
4.This passage may be taken from ________.
A．a medicine book B．a novel
C．a science magazine D．an experiment report
5.The underlined word “protected” in the third paragraph can be replaced by ______.
A．damaged B．polluted C．prevented D．guarded
难度: 中等查看答案及解析
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What will man be like in the future — in 5,000 or even 50,000 years from now? We can only make guesses, of course, but we can be sure that he will be different from what he is today, for man is slowly changing all the time.
Let us take an obvious example. Man, even five hundred years ago, was shorter than he is today. Now, on average, men are about three inches taller. Five hundred years is relatively a short period of time, so we may suppose that man will continue to grow taller. Again, in the modern world we use our brains a great deal. Even so, we still make use of only about 20% of the brain’s capacity(容量). As time goes on, however, we shall have to use our brains more and more, and finally we shall need our brains more and more, and finally we shall need larger ones! This is likely to bring a physical change too: the head, in particular the forehead, will grow larger.
Nowadays our eyes are in constant use. In fact, we use them so much that very often they become weaker and we have to wear glasses. But over long period of time it is likely that man’s eyes will grow stronger.
On the other hand, we tend to make less use of our arms and legs. These, as a result, are likely to grow weaker. At the same time, however, our fingers will grow more sensitive because they are used a great deal in modern life.
But what about hair? This will probably disappear from the body altogether in course of time because it does not serve a useful purpose any longer. In the future, then, both sexes are likely to be bald.
Perhaps all this gives the impression that future man will not be a very attractive creature to look at! This may well be true. All the same, in spite of all these changes, future man will still have a lot in common with us. He will still be a human being, with thoughts and motions similar to our own.
1.The passage mainly tells us that __________.
A．Man’s life will be different in the future
B．Future man will look quite different from us
C．Man is growing taller and uglier as time passes
D．Man’s organs’ functions will change
2.What serves as the evidence that man is changing?
A．Man has got stronger eyes now than he ever had.
B．Man’s hair is getting thinner and thinner.
C．Man’s arms and legs have become lighter and weaker.
D．Man has been growing taller over the past 500 years.
3.The change in man’s size of the forehead is probably because __________.
A．he makes use of only 20% of the brain’s capacity
B．his brain has grown larger over the past centuries
C．he will use his brain more and more as time goes on
D．the other 80% of his brain will grow in due time
4.Which of the following is TRUE about a human being in the future?
A．He is hairless because hair is no longer useful.
B．He has smaller eyes and wears better glasses.
C．His fingers grow weaker because he doesn’t have to make use of them.
D．He thinks and feels in a different way.
5.It is implied that __________.
A．human beings will become less attractive in the future
B．body organs will become poorer if they are not used often
C．human beings hope for a change in the future life
D．future life is always predictable
难度: 中等查看答案及解析
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1. Lucas is experiencing the hardest time in life these days. As manager of a trade company, he is responsible for the loss of a big business contract as he made a wrong decision. He wonders whether he has the ability to be a good manager, and he’s even considering leaving his job. He doesn’t know what to do and badly needs help.
2.Whitney has been out of work for several weeks now since she left her last job. She has been trying to find another one, but with no luck. She urgently needs a new job, so she’s searching for advice on how to make the best use of her time so as to successfully get a job.
3.After a job interview, Ralph was told that the company would like to have him as one of its staff. He would sell the company’s products if he worked there. However, he’s not sure whether he is good at selling things or not, so he’s looking for a way to find out about this before taking the job.
4.Thomas Howard is 23 years old, working at a gas station. He earns little money every week, feels that his life is hopeless, and never thinks that things will be better for him. His mother is worried about this and wishes to find a way to inspire her son.
5.Katrina is quite worried recently, because her manager seems to be turning on her, criticizing her in front of her colleagues for things that she does quite well. What’s worse, he even tells others that she has several boyfriends at the same time, which is of course not true. She really wishes to find a way for her problem.
难度: 中等查看答案及解析