单项选择题

Machines are designed to help restore our intrinsic system of checks and balances of our biology.

A．genetic
B．innate
C．internal
D．inert
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单项选择题
Mother told me to take an umbrella with me; it might come in handy, she said.
A．be convenient
B．be useful
C．get cloudy
D．start raining
单项选择题
The synergy of humans, society and machines is the fundmental cause of the unparalleled material prosperity of many nations.
A．unpopular
B．unpredictable
C．unquestionable
D．unprecedented
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