单项选择题

However, at times this balance in nature is ______ , resulting in a number of possibly un foreseen effects.

A．troubled
B．disturbed
C．confused
D．puzzled
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In 1914, an apparently insignificant event in a remote part Of Eastern Europe ______ Europe into a great war.
A．increased
B．imposed
C．passed
D．plunged
单项选择题
Does everyone on earth have an equal right ______ an equal share of its resources
A．by
B．at
C．to
D．over
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