__ .
A to trace and locate enemy vessels
B to monitor deep-sea volcanic eruptions
C to study the movement of ocean currents
D to replace the global radio communications network
33. The deep-sea listening system makes use of ____ .
A the sophisticated technology of focusing sounds under water
B the capability of sound to travel at high speed
C the unique property of layers of ocean water in transmitting sound
D low-frequency sounds travelling across different layers of water
34. It can be inferred from the passage that____.
A new radio devices should be developed for tracking the endangered blue whales
B blue whales are no longer endangered with the use of the new listening system
C opinions differ as to whether civilian scientists should be allowed to use military technology
D military technology has great potential in civilian use
35. Which of the following is true about the U.S. Navy underwater listening network﹖
A It is now partly accessible to civilian scientists.
B It has been replaced by a more advanced system.
C It became useless to the military after the cold war.
D It is indispensable in protecting endangered species.
Passage Four
Questions 36 to 40 are based on the following passage
The fitness movement that began in the late 1960s and early 1970s centered around aerobic exercise (有氧操). Millions of individuals became engaged in a variety of aerobic activities and literally thousands of health spas developed around the country to capitalize (获利) on this emerging interest in fitness particularly aerobic dancing for females. A number of fitness spas existed prior to this aerobic fitness movement even a national chain with spas in most major cities. However their focus was not on aerobics but rather on weight-training programs designed to develop muscular mass strength and endurance in their primarily male enthusiasts. These fitness spas did not seem to benefit financially from the aerobic fitness movement to better health since medical opinion suggested that weight-training programs offered few if any health benefits. In recent years however weight training has again become increasingly popular for males and for females. Many current programs focus not only on developing muscular strength and endurance but on aerobic fitness as well.
Historically most physical-fitness tests have usually included measures of muscular strength and endurance not for health-related reasons but primarily because such fitness components have been related to performance in athletics. However in recent years evidence has shown that training programs designed primarily to improve muscular strength and endurance might also offer some health benefits as well. The American College of Sports Medicine now recommends that weight training be part of a total fitness program for healthy Americans. Increased participation in such training is one of the specific physical activity and fitness objectives of Healthy People 2000 National Health Promotion and Disease Prevention Objectives.
责任编辑:joyyy
