U4-A-B3 prehension Directions: There are two passages in this part. Each passage is followed by some questions or unfinished statements. For each of them there are four choices. Click on the best choice. (20 points) Passage One A scientific panel convened by the World anization mended guidelines on Friday for doctors conducting clinical studies of SARS patients. The panel urged doctors to apply the guidelines in analyzing the masses of potentially useful information about various therapies that were collected in this year's epidemic. Much of that information has not been published or analyzed. "It isa matter of urgency to get better analysis and review," said Dr. Simon Mardel, a WHO official who led the two-day meeting that ended on Friday. He said thousands of potential therapies pounds had been tested so far as researchers try to determine treatments for SARS, or severe acute respiratory syndrome. "We recognize that having no treatment for SARS is hindering our ability to control an epidemic in so many ways." He said. In the epidemic earlier this year, various treatments, like drugs to fight the virus or strengthen the immune system, as well as traditional Chinese medicine, were delivered under emergency conditions, in widely different settings and countries to patients suffering from varying stages of the illness. Those conditions — generally without standardized measurements or controlled situations — have made it hard to interpret results. Standard supportive therapy like nursing, and in severe cases the use of mechanical respirators ( 呼吸器) to help patients breathe, is the mainstay ( 主要支持) of SARS care, and helped many patients survive. But doctors still do not know how best to treat SARS pa tients who have breathing difficulties, Dr. Mardel said. One method is invasive ventilation. A second method involves blowing oxygen into the lungs through a mask. Both carry the risk of transmitting the virus to hospital employees. Without proper analysis, the panel was un
