单项选择题

There are several theories as to why the dinosaurs become ______.

A．extinct
B．credible
C．distinct
D．esthetic
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单项选择题
The word effect (Line 1, Para. 1) is closest in meaning to ______ .
A．value
B．argument
C．strike
D．restraint
单项选择题
It can be inferred in the passage that the Homestead Act of 1862 ______.
A．increased the money supply in the West
B．was a law passed by state governments in the West
C．made it increasingly possible for settlers to obtain land in West
D．established tariffs in a number of regions
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