单项选择题

Projects connected with the development of the Nature Park are

A．self sustaining.
B．narrow in scope and vision.
C．attracting world-wide attention.
D．amassing scientific data.
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单项选择题
Summer camps in the area will
A．be designed for foreign visitors.
B．be educational.
C．attract scientists and ecologists.
D．house field labourers and their families.
单项选择题
According to marine ecologists, transplanted marine species
A．may upset the ecosystems of coastal waters.
B．are all compatible with one another.
C．can only survive in their home waters.
D．sometimes disrupt shipping lanes.
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