20. The underlined word "cautious" most probably means __________.

  A. cheerful    B. dutiful      C. helpful     D. careful

F

It was early morning. Peter Corbett helped Mark Wellman out of his wheelchair and onto the ground. They stood before El Capitan, a huge mass of rock almost three-quarters of a mile high in California’s beautiful Yosemite Valley. It had been Mark’s dream to climb El Capitan for as long as he could remember. But how could a person without the use of his legs hope to try to climb it?

Mark knew he couldn’t finish the climb alone, but his friend Peter, an expert rock climber, would be there to lend a helping hand. He and Mark thought that it would take seven days to reach the top.

Peter climbed about 100 feet up and hammered a piton(岩钉) into the rock. Fastening one end of a 165-foot rope to the piton, he let one end of the rope fall down. Mark caught the rope and fastened it to his belt with a special instrument.This instrument would allow Mark to move upward, but would prevent him from falling even as much as a single inch. He next reached above his head and fastened a T-shaped bar to the rope, using the same kind of instrument.

Mark took a deep breath, pushed the T-bar up almost as far as his arms could reach, and began the first of the 7,000 pull-ups needed to reach the top. High above, Peter let out a cheer. “You’re on your way.”

Seven years before, at the age of twenty-one, he had fallen while mountain climbing, injuring his backbone. The fall cost him the use of his legs, but he never lost his love of adventure or his joyful spirit.

For the first four days the two men progressed steadily upward without incident. But on the fifth day an unbearably hot wind began to blow, and as time went by, it became stronger and stronger, causing Mark to sway(摇摆) violently on his rope. But Mark kept on determinedly

pushing up the T-bar and pulling himself up. In spite of that, he had to admit that he felt a lot better when the wind finally died down and his body touched solid rock again.

It took them one day more than they had expected, but on July 26 at 1:45 in the afternoon, the crowd of people waiting on the top went wild with joy as the two heads appeared. Mark Wellman had shown that if you set your heart and mind on a goal, no wall is too high, no dream impossible.

16. According to the author, which of the following will not be affected by climate change?

  A. Economy.    B. Population growth.    C. Loss of life.  D. Investment.

E

   While the threat of a reappearance of SARS is still there, it is reassuring to learn about the latest developments in vaccine research.

   More than l, 400 vaccine shots for SARS have been produced in China, and an application for clinical tests has been referred to the State Food and Drug Administration(SFDA), according to a Xinhua report on Sunday.

   "If everything goes smoothly, conducting of clinical experiments will be agreed before the end of December," said Yin Hongzhang, head of the Biological Product Section of the SFDA.

   So far, China is far ahead of other countries in the search for a SARS vaccine, claimed Yin. At that time, volunteers will be sought in Beijing and Guangzhou to take part in experiments using the new vaccine. However, while cheering for the research breakthrough, voices of reason should also be heard.

   What medical workers should always maintain is a cool head and careful attitude, which are essential in any scientific research. This is especially true when conducting experiments on human beings, because they are directly concerned with the volunteers' health and even their lives, and also because knowledge of the deadly virus is still too limited.

Media reports indicate that members of the public are reacting actively to the news of selecting volunteers and are expressing their readiness. Their courage is well worth our admiration. The trust they are placing in these medical researchers is the biggest support of their work.

   The researchers have no other choice but to be highly cautious in the expected experiments. The safety of volunteers should always be the first consideration. Scientists from different countries have been put in a race in uncovering the mystery surrounding the virus. But to play a leading role should by no means be the ultimate pursuit (最终目标) of the scientific workers. It is people' s safety and health that remain the biggest concerns.

While there are still so many mysteries to be Solved, it is too early to celebrate.

                 (China Daily November 25, 2003)

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