单项选择题

The train came to an abrupt stop, making us wonder where we were.()

A. slow
B. noisy
C. sudden
D. jumpy

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单项选择题
Many scientists have been probing psychological problems().

A. solving
B. exploring
C. settling
D. handling
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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