单项选择题

Experts say the space rock is probably ______ more than $ 30,000.

A．weighty
B．costly
C．valuable
D．worth
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单项选择题
I was unaware of the critical points involved, so my choice was quite ______.
A．artistic
B．artificial
C．arbitrary
D．mechanical
单项选择题
Technology has ______ the sharing, storage and delivery of information, thus making more information available to more people.
A．finished
B．furnished
C．functioned
D．facilitated
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