单项选择题

Good health is a family's most valued possession.

A．noticeable
B．useful
C．costly
D．precious
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单项选择题
The concert was called off due to the storm.
A．recommended
B．demanded
C．amended
D．cancelled
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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