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(By) the end of the nineteenth century, organic chemistry had (develop) new (met
(By) the end of the nineteenth century, organic chemistry had (develop) new (met
游客
2025-02-10
34
管理
问题
(By) the end of the nineteenth century, organic chemistry had (develop) new (methods) for the (synthesis) of dyes, perfumes, explosives, and medicines.
选项
A、By
B、develop
C、methods
D、synthesis
答案
B
解析
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