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.
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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.
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.
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