单项选择题

About how many more whales have been sighted in the San Francisco Bay this year compared to last year（）

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

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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

Why might the increasing number of whales cause problems with their health（）

A．There's not enough room for them in Alaska.
B．There may not be enough food for them in Alaska.
C．They get pushed ashore.
D．there are more whales to spread diseas