单项选择题
______ has warmed the waters off Alask
A．A. El NinoB. The sunC. Over-populationD. Pressure
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单项选择题
One reason it is difficult to know why the whales are dying is that ______.
A．the whales travel such a long distance
B．there are more whales than there used to be
C．the whale bodies are too old to study by the time they are found
D．the whales are endangered
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单项选择题
The old man was very strange because ______.
A．he liked to live alone
B．people didn't like him and were afraid of him
C．he liked to walk in the woods without roads
D．he didn't do anything as the others did
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