We may face a severe worldwide water shortage in the future because ______.

A．some of it has been polluted

B．the small amount of fresh water is constantly being replaced by rainfall

C．our need for fresh water is increasing rapidly

One of the effects of directed research is to______.

A．give rise to feelings of hostility among scientists of different branches

B．involve an increasing number of scientists in a lot of extra work

C．get scientists directly involved in research projects with immediate industrial applications

D．yield fewer results with a greater amount of manpower and materials

In the author's opinion, the price of the firm's metals rises because

A．companies offer an additional amount of money to buy others' shares.

B．wares are increasing along with the merger.

C．Nickel and copper makes up the most part of the firm.

D．shares of the companies are increasing.

m the passage？

A．Family members became more economically dependent on each other.

B．The percentage of families involved in industrial work declined dramatically.

C．Family members became more emotionally bonded to one another.

D．Family members spent an increasing amount of time working with each other.

Why is scientific training becoming less attractive to U. S. students？

A．Because the U. S. students are unwilling to face the competitions between them and foreign students.

B．Because it is not so rewarding in this career path as before due to the increasing amount of students.

C．Because foreign students take up good position in this field for their advantage.

D．Because U. S. students do not think scientific training can help them make a lot of money.

g as possible reasons for the ornamentation of male plumage EXCEPT

A．Adornment attracts females on the basis of unconscious aesthetic preferences, increasing their evolutionary advantage.

B．Adornment attracts females to males who resemble their preferred food source, thus contributing to the mating process.

C．Adornment among males signifies heightened physical activity to females, thereby indicating evolutionary superiority.

D．Adornment reduces the amount of energy necessary to frighten rival males, thereby conserving resources.

E．Adornment in plumage frightens rivals away from a limited food source, thereby ensuring a dominant male's survival.

nd of cooking oil. McDonald's aims to make its French fries and other fried foods healthier.

The change will not affect the taste or the number of calories in the food. But by changing the cooking oil, McDonald's says, it hopes to cut by nearly half the amount of trans-fatty acids(轉(zhuǎn)換脂肪酸) in French fries and reduce the amount of saturated fats(飽和脂肪) by 16 percent. Scientists believe that trans-fatty acids and saturated fats raise cholesterol(膽固醇) levels and increase the risk of heart disease.

McDonald's new step is important because McDonald's is an industry leader and other fast-food chains and food processors may follow the lead.

For McDonald's, the action comes at a time when Americans are becoming more and more concerned about; obesity(肥胖) is an increasing pressure on food companies to offer healthy food to consumers.

After three years of study, McDonald's officials say they are switching oil that is lower in saturated fats and trans-fatty acids. McDonald's says the change will not cause higher coats for consumers.

Though there is some change, scientists say that the amount of trans-fat in foods at McDonald's and at other fast-food companies is still important.

The main idea of the text is ______.

A．McDonald's is a pioneer in food products

B．McDonald's is enlarging its restaurants in the world

C．fried foods can't keep up with the development of moden society

D．McDonald's is to use new cooking oil

______the increasing amount of new traffic. This is roughly $2 billion more than the company had 【D3】______ in the previous year. Specifically, AT&T will add 2, 000 new cell sites and upgrade existing cell sites with three times more fiber links than it had in 2009. This will increase【D4】______ to connect the cell towers to AT&Ts main network. AT&T, which is the only wireless【D5】______ in the US selling the iPhone, has been the【D6】______of much criticism over this past year, as many iPhone 【D7】______, particularly in densely populated urban areas, have【D8】______ about dropped calls, slow Internet access, and poor service. Some critics claim the company has not been spending enough on network upgrades to【D9】______ with growing demand. AT&T has【D10】______ that it has faced some difficulties, particularly in big cities. But the company is "closing the gap".

【D1】

ulation will tremendously increase urban wastes, primarily sewage. On the other hand, increasing demands for water will decrease substantially the amount of water available for diluting wastes. Rapidly expanding industries which involve more and more complex chemical processes will produce larger volumes of liquid .wastes, and many of these will contain chemicals which are noxious. To feed our rapidly expanding population, agriculture will have to be intensified. This will involve ever-increasing quantities of agricultural chemicals. From this, it is apparent that drastic steps must be taken immediately to develop corrective measures for the pollution problem.

There are two ways by which this pollution problem can be dwindled. The first relates to the treatment of wastes to decrease their pollution hazard. This involves the processing of solid wastes "prior to" disposal and the treatment of liquid wastes, or effluents, tn permit the reuse of the water or minimize pollution upon final disposal.

A second approach is to develop an economic use for all or a part of the wastes. Farm manure is spread in fields as a nutrient or organic supplement. Effluents from sewage disposal plants are used in some areas both for irrigation and for the nutrients contained. Effluents from other processing plants may also be used as a supplemental source of water. Many industries, such as meat and poultry processing plants, are currently converting former waste products into marketable by products. Other industries are exploring potential economic uses for their waste products.

The purpose of this passage is ______.

A．to acquaint the reader with water pollution problems

B．to alert the reader to the dwindling water supply

C．to explain industrial uses of water

D．to demonstrate various measures to solve the pollution problem

【T19】

A. ALL AF THAT

B. AS IF IT WERE

C. FRESH WATER SUPPLY

D. IN THIS FIELD A. A LIMITED【T13】______

B. SO THAT IT CAN BE USED AGAIN JUST【T14】______ FROM A SPRING

C. AND WE CANNOT EVEN USE【T15】______

D. EXPERIMENTS HAVE ALREADY BEEN DONE【T16】______ THE WORLD IS NOT ONLY HUNGRY, IT IS ALSO THIRSTY FOR WATER. IT SEEMS THERE IS PLENTY OF WATER, BUT ABOUT 97% OF THIS HUGE AMOUNT IS SEA-WATER, OR SALT WATER. MAN CAN ONLY DRINK AND USE THE OTHER 3% FRESH WATER.【T17】______ , BECAUSE SOME OF IT IS IN THE FORM. OF ICEBERGS AND GLACIERS. EVEN WORSE, SOME OF IT HAS BEEN POLLUTE

D. AT THE MOMENT, HIS SMALL AMOUNT OF FRESH WATER IS STILL ENOUGH FOR US. HOWEVER, OUR NEED FOR WATER IS INCREASING RAPIDLY. ONLY IF WE TAKE STEPS TO DEAL WITH THIS PROBLEM NOW, CAN WE AVOID A SEVERE WORLDWIDE WATER SHORTAGE LATER O

N. ONE OF THE USEFUL STEPS WE CAN TAKE IS TO STOP UNLIMITED USE OF WATER.【T18】______ , HOWEVER, WOULD HAVE A BAD EFFECT ON AGRICULTURE AND INDUSTRY. IN ADDITION TO STOPPING WASTING OUR PRECIOUS WATER, ONE MORE USEFUL STEP WE SHOULD TAKE IS TO DEVELOP WAYS OF REUSING IT.【T19】______ , BUT ONLY ON A SMALL SCAL

E. TODAY, IN MOST LARGE CITIES, WATER IS USED ONLY ONCE AND IT EVENTUALLY RETURNS TO THE SEA OR RUNS INTO UNDERGROUND STORAGE TANKS. BUT IT IS POSSIBLE TO PIPE WATER THAT HAS BEEN USED TO A PURIFYING PLANT. THERE IT CAN BE FILTERED AND TREATED WITH CHEMICALS【T20】______