Five times in the earth’s history, some three-quarters of all living species disappeared forever-and within a short period of time. Those species losses stand for a major change in the planet’s ecology(生态学). Clues to these changes can be seen in the fossils(化石)and rock layers.

Today, human activities are driving species to die out at a rate never seen before. And this loss of species really does matter, said Anita Narwani. She works at the University of Michigan in Ann Arbor. That’s because the diversity(多样性)of species in an ecosystem provides people with all types of services we can’t do without.

Trees provide oxygen for us to breathe. At the same time, they remove carbon from the air which is a cause of global warming. Plants help clean air and water. Animals move seeds from one area to another. A broad range of living resources also provides people with food, shelter and medicine.

Narwani wanted to find out how important the diversity of species is for people. So she teamed up with other ecologists to review more than 1,700 studies. They found that more diverse parts of the earth tend to do well in things like removing carbon and providing us with wood and other natural resources. They were also better at keeping fisheries large and healthy so that they could feed many people.

Unfortunately, the diversity of species is in steep drop. It is too soon to say that the earth is undergoing a sixth mass extinction, Narwani said. She said a mass extinction means the loss of 75 percent of species over 2 million years or less. We haven’t lost that many – at least not yet. But according to her, if species losses continue so fast, such a mass extinction could occur in just 300 years.

The new findings highlight the potential for humans to use up many of the resources on which we now depend. As people learn more, however, they can take steps to lessen those risks. People should protect ecosystems so that they can continue to provide us with their services.

1.What’s the writer’s purpose in giving the examples in Paragraph 3?

A. To tell us how we get our food and resources.

B. To show the importance of the diversity of species.

C. To tell us the use of each species.

D. To show the writer is very learned.

2.The underlined word “They ” in Paragraph 4 refers to .

A. humans

B. Narwani and her team

C. natural resources

D. various species

3.Narwani and her team found that .

A. many people know the importance of protecting wildlife

B. many species die out because of human activities

C. making good use of natural resources benefits people

D. rich diversity of species greatly benefits people

4. We can learn from Paragraph 5 that .

A. the world’s species are dying out in a very fast rate

B. we’ll lose 75 percent of species on the earth

C. the earth is undergoing a sixth mass extinction

D. a mass extinction of species will occur in 300 years

After the birth of my second child, I got a job at a restaurant. Having worked with an experienced for a few days. I was to wait tables on my own. All went that first week. When Saturday night came, I was luckily the tables not far from the kitchen. , I still felt it a little hard to carry the heavy trays (托盘).

Before I knew it, the was full of people. I moved slowly, every step. I remember how I was when I saw the tray stand near the tables; it looked different from the one I was on. It had nice handles, which made it to move around. I was pleased with everything and began to I was a natural at this job.

Then, an old man came to me and said, “Excuse me, dear, my wife and I loved you work. It seems your tray stand has been very to you, but we are getting ready to now, and my wife needs her back.”

At first his did not get across. “What was he talking about!” Then, I got it. I had set my trays on his wife’s orthopedic walker (助步器). I stood frozen as ice, but my face was . I wanted to get into a hole and .

Since then, I have learned from many mistakes such as the one I just . I have learned to be more and not to be too sure of myself.

1.A. manager B. assistant C. cook D. waitress

2.A. promised B. invited C. allowed D. advised

3.A. well B. quickly C. safely D. wrong

4.A. left B. given C. brought D. shown

5.A. Therefore B. However C. Otherwise D. Finally

6.A. kitchen B. street C. restaurant D. table

7.A. minding B. changing C. taking D. saving

8.A. angry B. calm C. sad D. happy

9.A. fixed B. trained C. loaded D. waited

10.A. slower B. lighter C. easier D. quieter

11.A. believe B. agree C. regret D. pretend

12.A. letting B. making C. watching D. having

13.A. useful B. familiar C. unusual D. interesting

14.A. rest B. order C. eat D. leave

15.A. bag B. walker C. tray D. coat

16.A. idea B. praise C. message D. need

17.A. cold B. full of joy C. pale D. on fire

18.A. lie B. hide C. defend D. stay

19.A. repeated B. discovered C. corrected D. described

20.A. careful B. patient C. honest D. practical

People in the United States honor their parents with two special days:Mother’s Day, on the second Sunday in May, and Father’s Day, on the third Sunday in June. These days are set aside to show love and respect for parents. They raise their children and educate them to be responsible(有责任感的) citizens. They give love and care. These two days make us think about the changing roles of mothers and fathers. More mothers now work outside the home. More fathers must help with child care.

These two special days are celebrated in many different ways. On Mother’s Day people wear carnations. A red one symbolizes a living mother. A white one shows that the mother is dead. Many people attend religious services to honor parents. It is also a day when people whose parents are dead visit the cemetery(墓地).On these days families get together at home, as well as in restaurants. They often have outdoor barbecues for Father’s Day. These are days of fun and good feelings and memories.

Another tradition is to give cards and gifts. Children make them in school. Many people make their own presents. These are valued more than the ones bought in stores. It is not the value of the gift that is important, but it is “the thought that counts”. Greeting card stores, florists, candy makers, bakeries, telephone companies, and other stores do a lot of business during these holidays.

1.Which of the following is NOT a reason for children to show love and respect for parents?

A.Parents bring up children.

B.Parents give love and care to children.

C.Parents educate children to be good persons.

D.Parents pass away before children grow up.

2.What do you think “florists” do?

A.They sell flowers.

B.They make and sell bread.

C.They offer enough room for having family parties.

D.They sell special gifts for Mother’s Day and Father’s Day.

3.Which do you think is right about “carnation”?

A.It has only two kinds of colors.

B.It refers to the special clothes people wear on Mother’s Day or Father’s Day.

C.It’s a kind of flower showing love and best wishes.

D.People can wear carnations only on the second Sunday in May.

4.What do you know from the passage?

A.Mother’s Day and Father’s Day are both in May.

B.Fewer women worked outside the home in the past.

C.Not all the children respect their parents

D.Fathers are not as important as mothers at home.

5. On Mother’s Day and Father’s Day, .

A.people usually have family parties

B.everyone goes to visit the cemetery

C.children always go to parents’ home

D.hand-made cards are the most valuable gifts

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

We all know the importance of curiosity, and here are some tips on how to develop it.

Keep an open mind. This is essential if you are to have a curious mind. Be open to learning, unlearning, and relearning things. 1. Therefore, you should be prepared to accept this possibility and change your mind.

2. Most people just accept the world as it is. This way, they will certainly lose the “holy curiosity”. Try to dig deeper beneath the surface of what is around you. A sure way to dig deeper beneath the surface is asking questions. What, why, when, who, where, and how are the questions curious people always ask.

Don’t label anything as boring. Whenever you label something as boring, you close one more door of possibilities. Curious people are unlikely to consider things boring. 3. Even if they don’t yet have time to explore them, they will leave the door open to be visited another time.

Take learning as something fun. If you see learning as a burden, there’s no way you will want to dig deeper into anything. That will just make the burden heavier. However, if you think of learning as something fun, you will naturally want to dig deeper. 4.

Read diverse materials. It will introduce you to the possibilities and excitement of other worlds which may attract your interest in exploring further. One easy way to do this is through reading diverse materials. 5. It’ll feed your mind with the excitement of a new world.

A. It doesn’t matter that you don’t agree to others’ opinions.

B. Try to pick a book or magazine on a new subject.

C. Some things you know and believe might be wrong.

D. Don’t spend too much time on just one world.

E. Never take things as granted.

F. So look at life through the glasses of fun and enjoy the learning process.

G. Instead, they always see these things as a door to an exciting new world.

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