Every year gray whales migrate from the

练习题库2022-08-02 53

问题 Every year gray whales migrate from the Bering Sea in Alaska to the Baja Peninsula in Mexico.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．About how many more whales have been sighted in the San Francisco Bay this year compared to last year?A.Twice as manB.Three times as manC.Half as manD.About the sam

选项 A.Twice as man
B.Three times as man
C.Half as man
D.About the sam

答案 B

解析由最后一段可知。今年在旧金山海湾地区看到了65只鲸，去年是17只。所以今年大约是去年的三倍。

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Every year gray whales migrate from the

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