单项选择题
A. El Nino B. The sun C. Over-population D. Pressure
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
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