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.

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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.