单项选择题

The phrase "touch-off'‘(Para 3, Line 1) most probably means ________.

A．talk about shortly
B．start or cause
C．compare with
D．oppose
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单项选择题
The word subjects in paragraph 4 means ________.
A．something to be considered
B．branch of knowledge studied
C．persons chosen to be studied in an experiment
D．any member of a state except the supreme ruler
单项选择题
The doctor's test shows that ________.
A．our brains shrink as we grow older
B．sixty-year-olds have better brains than thirty-year-olds
C．the front section of the brain does not shrink
D．some people's brains have contracted more than other people's
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