单项选择题

Forests are delicate systems that if disturbed can be permanently destroyed.

A．expansive
B．complex
C．unusual
D．fragile
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单项选择题
The Charter had been ratifiedby a majority of the participants who were the ones that asked for its draft.
A．challenged
B．approved
C．distributed
D．attacked
单项选择题
You don t have to be afraid of being eaten there in New Zealand because it has few predatorycreatures.
A．wild
B．preying
C．native
D．poisonous
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