单项选择题

The reason for the high death rate of oral cancer is _________.

A．lack of confidence and cooperation with the doctor
B．lack of an early diagnosis
C．not treated at an advanced stage
D．doing nothing at all
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单项选择题
According to the passage, the lesion Balanoff found was _________.
A．usually caused by excessive smoking
B．an obvious case of cancer sores
C．a cancer lump
D．leading Zember to death
单项选择题
Which of the following is true according to the passage
A．Doctors always use raspberry-flavored solution
B．Stage-three cancer could be a killer
C．Seeing is believing
D．Zember's cancer came from peppery food
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