单项选择题

The Midwest is America's most important ______ area.

A. agricultural
B. industrial
C. manufacturing
D. mining industry
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单项选择题
New Zealand is sometimes called the world's biggest farm. It is the world's largest exporter of ______.
A. beef
B. lamb and mutton
C. wheat
D. corn
单项选择题
The Cooperative Principles were put forward by ______.
A. John Langshaw Austin B. J. Firbas
C. Herbert Paul Grice
D. H. L. Smith
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