单项选择题
Which statement do the researchers think is wrong
A.They know how a tumor is developed.
B.They know now 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
What data can the handheld computers NOT record
A.The direction in which an animal is moving.
B.The black market value of an animal's skin.
C.Fluctuations in water levels.
D.The apparent state of an animal's healt
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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
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