In all cases, more researches are needed to determine what benefits aspirin may provide and whether these benefits would outweigh the potential side effects. Aspirin, for example, is known to cause gastrointestinal (胃肠的) bleeding with heavy use, and there is research that indicates an increased risk of bleeding-related stroke in people who use it regularly. In some cases, these reactions can be killers. Another potentially deadly problem is aspirin poisoning and most people don’t know about it.

　　Before you start taking any of these over-the-counter (不需处方也可出售的) drugs on a long-term basis, it’s a good idea to discuss it with your health care provider.

　　1. From the second paragraph we know　.

　　A. Humans have fully understood the benefits of aspirin.

　　B. Aspirin is the only member of non-steroidal anti-inflammatory drugs.

　　C. Not every one of us can take aspirin.

　　D. Aspirin can be used to stop bleeding.

　　2. What’s the third paragraph mainly about?

　　A. Many researches about aspirin.

　　B. Aspirin’s side effects.

　　C. New uses of aspirin.

　　D. The unknown aspects about aspirin.

　　3. The underlined word in the first paragraph means　.

　　A. kept 　B. saved

　　C. investigatedD. removed

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