题目内容
A．incentiveB．purposeC．resultD．motive
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Section B
Directions: In this section, you will hear 3 short passages. At the end of each passage, you will hear some questions. Both the passage and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A, B, C and D.
听力原文： A new study reports the common drug aspirin greatly reduces life threatening problems after an operation to replace blocked blood vessels to the heart. More than 800,000 people around the world have this heart surgery each year. The doctors who carried out the study say giving aspirin to patients soon after the operation could save thousands of lives (26) . People usually take aspirin to control pain and reduce high body temperature. Doctors also advise some people to take aspirin to help prevent heart attacks. About 10 to 15 percent of these heart operations end in death or damage to the heart or other organs. The new study shows the even a small amount of aspirin reduced such threats. The doctors said the chance of death for patients who took aspirin would fall by 67%. They claimed this was true if the aspirin was given within 48 hours of the operation. The doctors believe aspirin helps heart surgery patients because it can prevent blood from thickening and blood vessels from being blocked (27) . However, the doctors warned that people who have stomach bleeding or other bad reactions from aspirin should not take it after heart surgery (28) .
(27)
A．certainB．efficientC．capableD．effective
有3个关系R、S和T如下图所示。
过运算得到关系T，则所使用的运算为()。
In the last paragraph, the author uses which of the following in making his point？
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