单项选择题

Which statement is true according to the passage

A．Mastectomy used to be considered the only safe course.
B．The chances of survival after a mastectomy are greater than after lumpectomy.
C．Mastectomy can decrease the patients' chances of a care.
D．Most women prefer lumpectomy.

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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.

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