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 identified cause of the problem is

A．the rapidity with which larvae mature.
B．a common practice of the shipping industry..
C．a century-old species.
D．the worldwide movement of ocean currents.

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.