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

Which statement cannot be inferred from the passage

A．The mortality rate for breast cancer dropped.
B．The mortality rate among black women has increased.
C．The number of reported breast cancer cases is rising.
D．A woman's lifetime risk of breast cancer is risin

单项选择题

Which statement does not agree with the text

A．Mastectomy is the only reasonable choice for a woman with small breast and a large tumor.
B．Life-style and attitudes also play a role in the choice.
C．Many women make an improper decision in the treatment out of fear and lack of information.
D．Women are more likely to feel tired if they accept mastectomy.