单项选择题

Which statement do the researchers think is wrong

A．They know how a tumor is developed.
B．They know how a new tumor is seeded in the body.
C．They know how the female hormone estrogen makes breast cancer cells grow.
D．They know breast cancer is a death sentence to women.

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单项选择题

Which of the following statements does the passage support

A．The new scheme will eliminate the poaching in national parks.
B．Bushmen are too poorly educated to use modern technology.
C．Use of the CyberTracker will help to preserve rare animals.
D．The new system has doomed the kudu population.

单项选择题

The tone of the passage is ______.

A．scientific and factual
B．vague and imaginative
C．curious and enthusiastic
D．worried and pessimistic