[单项选择]Questions 50-52 refer to the following article.
Manufacturers have learned that consumers place a high value (50) convenience and disposability. Today, many products — such as cans, bottles, paper napkins, and even paper clothing — are designed and manufactured to be used once and then thrown away. Other consumer goods, ranging from wristwatches and umbrellas to major appliances such as air conditioners and VCRs, are manufactured in (51) a way that it is often cheaper and easier to discard and replace them if they break down than it is to have them (52) . A study showed that 26% of the solid waste that is thrown away in the United States consists of items that are designed to be discarded: disposable diapers, throwaway plastic pens and watches, and the like.

A. for
B. on
C. at
D. of

[单项选择]

The next two questions refer to the following passage:
A pharmaceutical company tested a new painkiller on 1,000 lab rats that were fed large doses of the painkiller for a two-month period. By the end of the experiment, 39 of tile rats had died. The company concluded that the painkiller was sufficiently safe to test on humans.

Which of the following, if true, provides the most support for the pharmaceutical company’s conclusion ？（）
A. The amount of painkiller fed to the rats was substantially greater, in relation to body mass, than the dosage any human would take under normal circumstances.
B. Because of the different body chemistry of humans and rats, some compounds can be dangerous for rats but safe for humans, and vice versa.
C. Tests of this same painkiller on dogs showed that 3 out of 50 dogs developed lesions on their livers during the course of the experiment.
D. The researchers found that during the experiment, the rats showed a significantly lower sensitivity to pain than rats do under normal circumstances.
E. In an experiment of this length with this number of rats, it is not unusual for up to 50 rats to die during the experiment for reasons unrelated to the experiment itself.

[单项选择]Questions 186-190 refer to the following advertisement and article.

When most people think of exercise, they usually think of things like running, jogging, jumping rope, lifting heavy weights, and so on. And all of these weight-bearing exercises involve the bones and muscles working against gravity. If you have problems standing for long periods of time, Chair Aerobics is the exercise for you.
Chair Aerobics lets you exercise your body while sitting in a chair. Consider the following:
· Chair aerobics is performed for about 20-30 minutes and consists of rhythmic movements.
· It is a low-impact exercise with almost no potential for damage to joints and enables you to perform your daily routine activities effectively.
· It lets you move your arms and legs to music while taking the weight off your feet.
· You don’t need special clothes, shoes, or space.
· No equipment
A. Basketball
B. Jogging
C. Running
D. Weight lifting

[单项选择]Questions 177-180 refer to the following information.

· Location: New York, New York
· Building Type: commercial office tower
· Construction System: steel frame, metal cladding
This report describes energy-saving measures taken by the building manager of the Chrysler Building. These measures range from the simple and quick to the expensive and time consuming.
The most significant energy saving measures were achieved by planting a variety of plants with different growth characteristics, both on the roof and on individual office balconies, which added cooling shade in the summer. The use of inexpensive exterior bamboo blinds during summer months produced significant reductions in need for air- conditioning, which saved the Chrysler building a considerable amount of money. Surprisingly, installing double-paned windows was the least cost-effective measure, des
A. They were used to provide shade or act as partitions in offices.
B. They made the air in the building very humid.
C. They were easy to install.
D. They helped lower the temperature of the building.