单项选择题

The shuttle exploded in the air suddenly and broke into ______ at once.

A．diversity
B．fragments
C．doctrine
D．drought
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单项选择题
Written at least 100 years ago, the handwriting faded and certainly became ______.
A．infinite
B．illegible
C．infectious
D．immune
单项选择题
For ten years the problem about the water has not been solved, we came to think that it has been a ______ problem in this area.
A．perpetual
B．persuasive
C．picturesque
D．possessive
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