单项选择题

We''ll visit Europe next year ______ we have enough money.

A．lest
B．until
C．unless
D．provided
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单项选择题
The bird flew upward and dropped the shellfish onto the rock to ______it open.
A．break
B．press
C．cut
D．shake
单项选择题
However, at times this balance in nature is_____, resulting in a number of possibly unforeseen effects.
A．troubled
B．disturbed
C．confused
D．puzzled
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