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
He was ______ by the noise outside yesterday evening and could not concentrate on his study.
A．pecked
B．oriented
C．perturbed
D．paddled
单项选择题
He had a clear ______ of what was wrong with the machine and fixed it in a short time.
A．debris
B．deficiency
C．perception
D．persecution
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