It was the day I froze a household pet that I began to worry about my memory. Technically, it was not a real household pet I fro

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问题     It was the day I froze a household pet that I began to worry about my memory. Technically, it was not a real household pet I froze but a bag of tropical fish, which on the scale of beloved members of any home, rank somewhere below the family cat and above an attractive set of coasters. And technically, I didn ’ t completely freeze my fish. Rather, I absent-mindedly threw them into the refrigerator with a bag of other things I had bought and fortunately found them just before my highly sensitive tropical fish could change into lightly breaded dinner fish.
    Nonetheless, that near-death experience—for the fish, if not for me—woke me up to the fact that my memory might not be all it once was.
    In the hope of improving my memory, I decided I would first try the memory books. However, much of what I read was, at first blush(一瞥), utterly forgettable.
    If I was truly going to juice up(活跃)my recall, however, book reading wouldn ’ t cut it. What I needed was some kind of memory pill. The big bat in the memory-pill lineup is ginkgo biloba(银杏), the dried leaf of the maidenhair tree(银杏树), thought to improve circulation and, in theory, memory. I decided to try it. The package warned that in addition to any other problems, ginkgo can cause "mild stomach discomfort". After just one pill, I discovered that the package was—how best to put this—not kidding. It’ s hard to say if my memory improved in the little time I was on ginkgo, but I can say I had no trouble at all remembering to eat a tasteless diet for several days afterward.
    For me, the answer to memory problems was not in the medicine chest, but that didn’ t mean I was a hopeless case. My recall had improved after two weeks in the memory-improvement battle. I may not be able to read a magazine and instantly memorize it, but I now remember to buy it when I get to the store. I may not be able to memorize hundreds of names and faces, but at least I won’ t meet an Alex at a party and find myself calling him Alan or Alvin or Evelyn.
It can be inferred from the passage that ginkgo______.

选项 A、can improve memory
B、works after the first pill
C、can produce several side effects
D、causes mild stomach discomfort

答案C

解析
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