单项选择题

______ percent of all cancers could be averted if people ate more fruits, vegetables, and plant-based foods and minimized high-fat, high-calorie edibles.

A．30—40
B．40—50
C．50—60
D．60—70
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单项选择题
In which situation Indians wouldn’t use sign language according to the passage
A．When they wanted to kill an enemy.
B．When they wanted to identify a stranger.
C．When they wanted to tell the time of the day.
D．When they wanted to send a message to a person far away.
单项选择题
Which of the following could NOT be used by Indians to make a signal
A．A small horse
B．Cigarettes
C．A mirror
D．Fire arrows
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