单项选择题

Scientists hope the collision will produce a large crater in the comet's surface in order to reveal the core and give some ______ to the origin of the solar system.

A．sources
B．interpretations
C．clues
D．observations
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单项选择题
Any time ______, any period of waiting is because you haven't come and received the message.
A．error
B．cut
C．lack
D．lag
单项选择题
Diamonds have little ______ value and their price depends almost entirely on their scarcity.
A．intricate
B．intact
C．intriguing
D．intrinsic
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