(单选题)
Why does the author mention practical inventions in paragraph 4?
A.To exemplify the reasons for the development of industry in America.
B.To show how America became rich by selling new products.
C.To illustrate how intelligent American inventors were.
D.To prove that most useful inventions came from America.
参考答案：A
参考解析：
定位到But greater strides were being taken in inventing. American manufacturing and agriculture was greatly improved. These improvements came from practical inventions. Richard Chenaworth invented the cast-iron plow. ... 可见文章提到实践性的发明是想要说明这些发明促进了美国的制造业和农业的发展，只有A项符合原文，故本题正确答案选A。
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