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
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
The first Chinese immigrants to the US
A．were welcomed with hospitality.
B．far outnumbered other minorities.
C．arrived mostly in the 1870s.
D．were met with obvious hostility.
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