— My children are always arguing.

— ____　

　　 A. Just leave them alone.　　　　　　 B. That’s right.

　 C. Are you sure?　　 　　　　　　 D. How old are the boys?

The word “conservation” has a thrifty meaning. To conserve is to save and protect, to leave what we ourselves enjoy in such a good condition that others may also share the enjoyment. Our forefathers had no idea that human population would increase faster than the supplies of raw materials: most of them, even until very recently, had the foolish idea that the treasures were “limitless” and could “last forever”. Most of the citizens of earlier generations knew little or nothing about the complicated and delicate system that runs all through nature, and which means that, as in a living body, an unhealthy condition of one part will sooner or later be harmful to all the others.

　　Fifty years ago, nature study was not part of the school work; scientific forestry was a new idea; wood was still cheap because it could be brought in any quantity from distant woodlands; soil destruction and river floods were not national problems; nobody had yet studied long-term climatic cycles in relation to proper land use; even the word “conservation” had nothing of the meaning that it has for us today.

　　For the sake of ourselves and those who will come after us, we must now set about correcting the mistakes of our forefathers. Conservation should be made part of everybody’s daily life. To know about the water table in ground is just as important to us as a knowledge of the basic math formulas. We need to know why all watersheds (上游集水区) need the protection of plant life and why the running current of streams and rivers must be made to give their full benefit to the soil before they finally escape to the sea. We need to be taught the duty of planting trees as well as of cutting them. We need to know the importance of big, grown trees, because living space for most of man’s fellow creatures on this planet is figured not only in square measure of surface but also in cubic (立方体的) volume above the earth. In a word, it should be our goal to restore as much of the original beauty of nature as we can.

The author’s attitude towards the use of natural resources is _________.

    A. positive         B. uninterested     C. optimistic           D. critical

According to the author, the greatest mistake of our forefathers was that _________.

　　A. they had no idea about scientific forestry

　　B. they had little or no sense of environmental protection

　　C. they were not aware of the importance of nature study

　　D. they had no idea of how to make good use of raw materials

To avoid repeating the mistakes of our forefathers, the author suggests that _________.

　　A. we plant more trees

　　B. natural sciences be taught to everybody

　　C. environmental education be directed toward everyone

　　D. we return to nature

How can you understand the underlined sentence in the last paragraph?

A. Our living space on the earth is getting smaller and smaller.

B. Our living space should be measured in cubic volume.

C. We need to take some measures to protect space.

D. We must preserve good living conditions for both birds and animals.

Any housewife who went to the new supermarket wished to be the lucky customer who did not have to pay for her shopping. This was what the 　21　just inside the entrance 　22　.It said: “Remember,　23　,one of our customers gets 　24　goods. THIS MAY BE YOUR LUCKY DAY!” For quite a long time Mrs. Edwards　25, like many of her  26, to be the lucky customer. Unlike her friends, she never　27　hoping. The 　28　in the kitchen was full of things which she did not need. Her husband tried to advise her 　29　buying so many things but failed. She 　30　dreamed of the DAY when the manager of the supermarket would come up to her and say, “Madam, THIS IS YOUR LUCKY DAY. Everything in your 　31　doesn’t need to be paid!” One Friday afternoon Mrs. Edwards shopped  32　.But she was not the lucky customer. No sooner had she just put the things inside her 　33　than she found that she had forgotten to 　34　tea. She dashed back to the 　35　, got some tea and went towards the　36　.As she did so, she saw the 　37　came.　38　his hand he said, “I want to 　39　you. You are our LUCKY CUSTOMER this week! Everything you have in your basket　40　 !”

America’s greatest technological achievement, the Hoover Dam, now has a companion piece, a bridge held up by the longest arch in the Western Hemisphere（半球）. The Mike O’Callaghan-Pat Tillman Memorial Bridge, which opened this month and connects the U.S. states of Arizona and Nevada, crosses the vast chasm（峡谷）890 feet above the Colorado River that is controlled by the dam.

The striking 1,900-foot-long structure will improve traffic in the region and help protect the dam from being destroyed. It is the seventh highest bridge in the world, behind four in China, one in Papua New Guinea and one in the US state of Colorado.

“The Hoover Dam is the greatest civil engineering achievement in America’s history,” said the bridge project manager Dave Zanatell. “Our goal was not to outdo or outshine it. Our goal was to, in a respectful way, do something that would be great for our generation and that would stand besides Hoover Dam in a respectful and quality way that would become a part of Hoover’s legacy（遗产）.”

Just as the Hoover Dam was built in the heart of the Great Depression（大萧条）and was seen as an example of the nation’s can-do spirit, some hope this project can also provide some uplift.

The bridge is surprising: at 1,050 feet, its support arch holds up a roadway that lies on 300-foot-long concrete pillars（柱子）, some of the tallest in the world. It contains 16 million pounds of steel.

　　The idea of the bridge came into being in the 1960s because the top of the Hoover Dam has been a narrow two-lane road that is the fastest route from Arizona to Las Vegas and then the Pacific Northwest and Canada.

  　Access to the dam from each direction is a dangerously winding route, but massive trucks and passenger vehicles shared it for decades. During the day, when thousands of tourists travel to the dam from Las Vegas three times as many accidents as on a normal road will happen.

  　The bridge has a sidewalk on the side facing the dam. The wall on both sides is 54 inches high, so walkers can take photos there.

Which of the following is true of the Hoover Dam?

   A. It was completed recently.

   B. It was built during the hard times.

   C. It has the longest arch.

   D. It’s the seventh highest dam in the world.

What is one of the purposes of building the bridge?

   A. To protect the dam.                                 B. To save the cultures.

   C. To outdo the dam.                                       D. To develop the tourism.

The underlined word “uplift” in Paragraph 4 means _____.

   A. lift of the heavy object                            B. support in money

   C. spiritual encouragement                           D. instruction in technology

Which of the followings shows the right position of the bridge and dam?

The text is mainly about ______.

   A. the Hoover Dam                                    

   B. American western development

   C. a tour along the Colorado River               

   D. a recently built bridge