单项选择题

The economy continued to exhibit signs of decline in September.()

A. play
B. show
C. send
D. tell

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

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