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  3. When was man’s life changed in many ways? How did the science of preparing metals for use happen?

When was man’s life changed in many ways? How did the science of preparing metals for use happen?

admin2009-01-15  28
问题 When was man’s life changed in many ways?
How did the science of preparing metals for use happen?
选项 A、By any planned purpose.
B、By chance.
C、With fire.
D、On the part of those who were concerned about it.
答案B
解析 浏览全文，就可以找到"…it(the science of preparing metal for use)happened more by chance than by any planned purpose…"，这与选项[B](偶然)说法完全一样，因此选项[B]正确．
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