68. The deep-sea listening system makes use of 　　　　.

A. the top-level technology of focusing sounds under water

B. the capability of sound to travel at high speed

C. the unique characteristic of layers of ocean water in carrying sound

D. low-frequency sounds traveling across different layers of water

67. The underwater listening system was originally designed 　　　　.

A. to trace and locate enemy ships 　　　　　　　　　　　　　

B. to observe deep-sea volcanic eruptions

C. to study the movement of ocean currents

D. to replace the global radio communications network

66. The passage is chiefly about 　　　　.

A. an effort to protect an endangered marine species

B. the civilian use of a military detection system

C. the expose of a US Navy top-secret weapon

D. a new way to look into the behavior of blue whales

70. The passage is written to ________.

A. give advice on how to stop eating high-fat meals

B. introduce a research on controlling appetite

C. discuss the argument between two professors

D. show different ways to trick the body

答案　 CADCB

Passage 62

(山东省济南外国语学校2010届高三上学期质量检测)

C

It is hard to track the blue whale, the ocean’s largest creature, which has almost been killed off by commercial whaling and is now listed as an endangered species. Attaching radio devices to it is difficult and visual sightings are too unreliable to give real insight into its behavior.

So biologists were delighted early this year when with the help of the Navy they were able to track a particular blue whale for 43 days recording its sounds. This was possible because of the Navy’s formerly top-secret system of underwater listening devices across the oceans.

Tracking whales is but one example of an exciting new world just opening to civilian (平民的) scientists after the cold war as the Navy starts to share and partly uncover its global network of underwater listening system built over the decades to track the ships of potential enemies.

Earth scientists announced at a news conference recently that they had used the system for closely observing a deep-sea volcanic eruption for the first time and that they planned similar studies. Other scientists have propose to use the network for tracking ocean currents and measuring changes in ocean and global temperatures. The speed of sound in water is roughly one mile a second-slower than through land but faster than through air. The most important thing is that different layers of ocean water can act as channels for sounds focusing them in the same way a stethoscope (听诊器) does when it carries faint noises from a patient’s chest to a doctor’s ear. This focusing is the main reason that even relatively weak sounds in the ocean especially low-frequency ones, can often travel thousands of miles.

69. Which of the following is TRUE about Wilde’s approach?

A. A kind of chemical is added to make a high-fat meal less fatty.

B. Fat is digested earlier and the body sends a signal telling the brain it’s full.

C. Fat won’t get broken down in the first part of the small intestines.

D. The chemical that breaks down fat will not reach the fat.

68. What can be inferred about Professor Bloom’s opinion towards Wilde’s approach?

A. It won’t work since the body’s regulatory systems will never be tricked.

B. It is sure to switch off the appetite of people with a weight problem.

C. It sounds terrible because regulating appetite through foods is not practical at all.

D. It’s no that easy to trick the body so more research should be done.

67. The underlined word “obesity” in Para. 2 most probably means “________”.

A. being too fat　　　　　　　　　　　　　　　　　　 B. eating too much food

C. stopping appetite　　　　　　　　　　　　　 D. being unhealthy

66. According to Wilde’s research, what could people do if they want to lose weight?

A. Eat more bread and yoghurt.　　　　　　　　　　　　 B. Trick the body by eating nothing.

C. Have foods with fat droplets coated.　　　　　 D. Control their digestive system strictly.

65. The example given in the last paragraph proves that a baby ________.

A. is born to be friendly to other babies

B. has interest in peers as well as in its mother

C. may have emotional attachments to another baby

D. shows jealousy and generousness as an adult

答案　 ABDBC

Passage 61

(湖南省长郡中学2010届高三第三次月考)

C

Want to lose weight? Try eating. That’s one of the ways being developed by scientists experimenting with foods that trick the body into feeling full.

At he Institute of Food Research in Norwich, England, food expert Peter Wilde and his colleagues are developing foods that slow down the digestive system, which then sends a signal to the brain that stops appetite. “That fools you into thinking you’ve eaten far too much when you really haven’t,” said Wilde. From his studies on fat digestion, he said it should be possible to make foods, from bread to yoghurt, that make it easier to diet. While the research is still in its early stages, Wilde’s approach to controlling appetite is one that some doctors say could be a key to solving the problem of obesity.

“Being able to switch off appetite would be a big help for people having trouble losing weight,” said Steve Bloom, a professor of investigative medicine at London’s Imperial College, who is not connected to Wilde’s research. Bloom said that regulating appetite through foods is theoretically possible. But Bloom warned that controlling appetite may be very challenging. “The body has lots of things to prevent its regulatory systems from being tricked,” he said.

Wilde’s research makes use of the body’s ways of digesting fat. Fat normally gets broken down in the first part of the small intestines(肠道). When you eat a high-fat meal, however, the body can only digest the fat entirely further down in the intestines, which then causes the body to produce a kind of chemical to stop the appetite.

Wilde’s approach copies what happens with a high-fat meal. He coats fat droplets(滴)in foods with modified proteins from plants, so it takes longer for the chemical that breaks down fat to reach it. That means that the fat isn’t digested until it hits the far reaches of the intestines. At that point, intestinal cells send a signal telling the brain it’s full. Even though the body hasn’t had a high-fat meal, it stops the appetite as if it has. If the fat had been digested earlier in the intestines, no such signal would be sent.

64. The underlined word “toddlers” in Para. 8 can be replaced by “_________”.

A. adults　　 B. infants　　 C. peers　　 D. groups