单项选择题

It is not possible for people to remember everthing that they have thought.

A．recall
B．appreciate
C．repeat
D．discuss
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单项选择题
A fossil is a remnant of a once-living organism.
A．bone
B．solvent
C．picture
D．vestige
单项选择题
In temperate regions the growth rings on turtles’ epidermal plates reflect seasonal variations in growth.
A．indicate
B．stimulate
C．include
D．prevent
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