单项选择题

24（）

A．good
B．poor
C．new
D．old

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单项选择题
______ has warmed the waters off Alaska.
A．El Nino
B．The sun
C．Over-population
D．Pressure
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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