单项选择题

There are two main requirements before the fifth-generation computer can become a reality and it is these that scientists are _________.

A．anticipating
B．tackling
C．manipulating
D．speculating
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单项选择题
It was believed that his death _________ with the robbery of the bank downtown.
A．accompanied
B．coincided
C．correlated
D．conformed
单项选择题
Some minerals are quite common, others are regionally _________, and still others are rare on the earth.
A．attributed
B．distributed
C．contributed
D．scattered
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