单项选择题

The chemical is deadly to rats but safe to cattle.

A. fatal
B. hateful
C. good
D. useful
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The conference explored the possibility of closer trade links.
A. denied
B. investigated
C. stressed
D. created
单项选择题
The train came to an abrupt stop, making us wonder where we were.
A. an uncertain
B. a slow
C. an unexpected
D. a smooth
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