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.

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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.

单项选择题

Oceanographers are concerned because

A．their knowledge of this phenomenon is limited.
B．they believe the oceans are dying.
C．they fear an invasion from outer space.
D．they have identified thousands of alien webs.