单项选择题

It is crucial that a broad set of people—not just technologists or those who happen to be in the computer industry______in the debate about how this technology should be shaped.

A．compensate
B．saturate
C．motivate
D．participate
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单项选择题
The first animals on this living sphere, the Earth, were primitive______animals, and then around 500 million years ago these sea animals developed shells.
A．versatile
B．marine
C．redatory
D．feasible
单项选择题
It is also important to have something that can clean water and kill______so water from other sources can be made safe to drink.
A．plasmodia
B．bacteria
C．criteria
D．malaria
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