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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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.
单项选择题
The newly discovered fault was extraordinary because
A．it caused a severe local earthquake in the past.
B．it pushes older rocks on the top of younger rocks.
C．it has three segments and covers a relatively large area.
D．it was hidden beneath California's largest city.
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