单项选择题

He is constantly late, and ill-prepared when he does finally arrive. He is jeopardizing his future.

A．developing
B．endangering
C．assuring
D．destroying
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单项选择题
Serial murderers rarely deviate from a certain type of prey.
A．attacker
B．nourishment
C．victim
D．enemy
单项选择题
Chaos theory stresses the magnitude of the results produced by so small an event as the fluttering of a butterfly's wings.
A．size
B．volume
C．result
D．fame
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