单项选择题

The physical differences between men and women can be ______ directly to our basic roles as hunters and child-bearers.

A) pursued
B) traced
C) switched
D) followed
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单项选择题
She keeps a supply of candles in the house in case of power______.
A) failure
B) lack
C) absence
D) drop
单项选择题
Some people believe that since oil is scarce, the ______ of the motor industry is uncertain.
A) terminal
B) benefit
C) fate
D) estimate
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