单项选择题

Before the invention of photoengraving,steel and copperplate engraving served as the principal means of reproducing illustrations.

A. visions

B. pictures
C. advertisements

D. pages
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单项选择题
The problem in America that the author is talking about in this passage is large amounts of food are lost in American().

A. Right
B. Wrong
C. Not mentioned
填空题
Dr. Fischer claims that agriculture will continue to develop ______.
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