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D. change your diet
61. Liptor?, Zocor?, Crestor? are .
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B. side effects
C. medicines
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63. Where can you most probably read this passage? A．In a travel guide book.
B．On a university bulletin board.
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C
C．In a health magazine. D．In a doctor's prescription
It’s hard to track the blue whale, which has almost been killed off by commercial whaling. 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 US Navy, they are able to track a particular blue whale for 43 days recording its sounds. This was possible because of the Navy’s former 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 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 proposed to use the network for tracking ocean currents and measuring changes in the ocean and global temperatures. 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.
64. 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
65. The deep-sea listening system makes use of __________________. A. the ability of sound to travel at high speed
B. the top-level technology of focusing sounds under water
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C. the unique characteristic of layers of ocean water in carrying sound D. low-frequency sounds traveling across different layers of water 66. What can we infer from the passage?
A. New radio devices are developed for tracking the blue whales. B. Blue whales are no longer endangered with the new system. C. Opinions differ on the use of military technology. D. Military technology has great potential in civilian use. 67. What is the passage chiefly about?
A. An effort to protect an endangered marine species. B. The civilian use of a military detection system. C. The exposure of a US Navy top-secret weapon. D. A new way to look into the behavior of blue whales. D
I needed to buy a digital camera, one that was simply good at taking good snaps (快照), maybe occasionally for magazines. Being the cautious type, I fancied a reliable brand. So I went on the net, spent 15 minutes reading product reviews on good websites, wrote down the names of three top recommendations and headed for my nearest big friendly camera store. There in the cupboard was one of the cameras on my list. And it was on special offer. I pointed at it and asked an assistant, “Can I have one of those?”? He looked perturbed (不安). “Do you want to try it first?” he said. It didn’t quite sound like a question. “Do I need to?” I replied ,“There is nothing wrong with it？” This made him look a bit insulted and I started to feel bad. “No, no. But you should try it,” he said encouragingly. “Compare it with the others. ”
I looked across at the others: shelves of similar cameras placed along the wall, offering a wide range of slightly different prices and discounts, with each company selling a range of models based around the same basic box. With so many models to choose from, it seemed that I would have to spend hours weighing X against Y, always trying to take Z and possibly H into account at the same time. But when I had finished, I would still have only the same two certainties that I had entered
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the store with: first, soon after I carried my new camera out of the shop, it would be worth half what I paid for it; and second, my wonderful camera would very quickly be replaced by a new model.
But something in the human soul whispers that you can beat these traps by making the right choice, the clever choice, the wise choice. In the end, I agreed to try the model I had chosen. The assistant seemed a sincere man. So I let him take out of my chosen camera from cupboard, show how it took excellent pictures of my fellow shoppers? and when he started to introduce the special features, I interrupted to ask whether I needed to buy a carry-case and a memory card as well. Why do we think that new options still offer us anything new? Perhaps it is because they offer an opportunity to avoid facing the fact that our real choices in this culture are far more limited than we would like to imagine. 68. The shop assistant insisted that the writer should________. A. try the camera to see if there was anything wrong with it. B. compare the camera he had chosen with the others. C. get more information about different companies. D. trust him and stop asking questions.
69. What does the writer mean by “it would be worth half what I paid for it ”(paragraph 2)
A. He should get a 50% discount.
B. The price of the camera was unreasonably high. C. The quality of the camera was not good. D. The camera would soon fall in value.
70. The writer decided to try the model he had chosen because he________. A. knew very little about it. B. didn’t trust the shop assistant
C. wanted to make sure the one he chose would be the best.
D. had a special interest in taking pictures of his fellow shoppers.
71. It can be inferred from the passage that in the writer’s opinion__________. A. people waste too much money on cameras
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B. cameras have become an important part of our daily life C. we don’t actually need so many choices when buying a product D. famous companies care more about profit than quality E
Beijing（13, July） China sent up a new data relay satellite, Tianlian I -02,
on Monday at the Xichang Satellite Launch Centre in South-western Sichuan province．The new satellite will promote the country's satellite communication network for space docking．
The satellite was launched on a Long-March-SC carrier rocket at 11:41 p．m．,
sources at the centre told Xinhua News Agency．The satellite separated from the rocket 26 minutes after its launch and was then successfully delivered into a geostationary transfer orbit. Developed by the China Academy of Space Technology under the China Aerospace Science and Technology Corporation, the satellite is the country's second data relay satellite．The first, Tianlian I -01, was launched on April 25．2008．
The two satellites will form a network to improve communications between China's
spacecraft and bases on Earth, according to the centre．They will also be used to help the nation's first space docking, scheduled for the second half of this year．
As planned, China will launch space module Tiangong-I, which was designed as
a platform that will dock with an unmanned spaceship, Shenzhou, for the county's first space-docking mission this year．
Two more Shenzhou spaceships will dock with Tiangong-I next year, and one will
be manned by two or three astronauts, according to China Manned Space Engineering Office, which was the main user of the Tianlian I series data relay satellites．
\new satellite can cover a greater area to track and command the country's
space vehicles in low-Earth orbits, such as manned spacecraft and remote sensing satellites, from a higher position in outer space．Only three satellites of this kind are needed to form a global communication network, and China has two now．\Pang Zhihao, a researcher and deputy editor-in-chief of Space International, said．
The satellite could also equip astronauts with real-time communications, which
will benefit the country's future manned space flights, he said．
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