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
People from ethnic ______ often face prejudice a and discrimination.
A．scarcities
B．minorities
C．minimum
D．shortages
单项选择题
Fields ______ to the nuclear facility were found to have high levels of radioactivity.
A．abrupt
B．adverse
C．adjacent
D．intact
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