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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单项选择题

The article suggests that a solution to the problem

A．is unlikely to be identified.
B．must precede further research.
C．is hypothetically easy.
D．will limit global shipping.

单项选择题

According to Dr Carlton, ocean organisms are

A．being moved to new environments.
B．destroying the planet.
C．succumbing to the zebra mussel.
D．developing alien characteristics.