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单选题
Eleven gray whales have died in the San Francisco Bay in the last three weeks．No one knows why the whales are dying.
Last year 270 whales died along the whales' migration route．Many people think starvation is the cause．This year the dead whales seem to have more blubber (fat) on them.
Twenty years ago, the gray whale was listed as an endangered species.
Some scientists think that the larger number of whales makes it hard to find enough food．More whales create more pressure on the food supply, a supply that some scientists say may have dwindled as a result of the warm waters of El Nino.
Most of the whales have been dead for many days before they are found and studied．This makes it hard to find the reason for death.
65 whales have been seen in the San Francisco Bay Area this year compared to 17 last year．The whales could be dying from many diseases, but it may be over-population．
Which of the following is NOT a possible reason for whales dying?
A
B
C
D
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答案：
解析：
：根据文章第五段的描述，鲸鱼可能因为食物短缺而死亡，而过量饮食是不可能的。因此，过量饮食不是鲸鱼死亡的可能原因之一。
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