单项选择题

There are fossil remains of dinosaurs In the rocky strata of every continent.

A．layers
B．areas
C．peaks
D．canyons
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单项选择题
Your plan will call for a lot of money.
A．acquire
B．require
C．remind
D．degrade
单项选择题
Penicillin was discovered by chance in 1928.
A．finally
B．accidentally
C．experimentally
D．opportunely
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