Which of the following is the main topic of the passage? [br] ______, the first

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问题 Which of the following is the main topic of the passage? [br] ______, the first chilled-steel plow made their appearance.

选项 A、In the 18th century
B、In 1869
C、In 1860
D、As early as 1790

答案 B

解析事实细节题。题目询问最早的冷铸钢犁是何时出现的。本题答案可从文章第二段末句得出：在1869年詹姆士&200958226;奥利弗生产出最早的冷铸钢犁。因此．选项B为正确答案。

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