2. 外语
  3. Penicillin was discovered by chance in 1928.

Penicillin was discovered by chance in 1928.

admin2012-07-29  53
问题 Penicillin was discovered by chance in 1928.
选项 A、finally
B、accidentally
C、experimentally
D、opportunely
答案B
解析 偶然
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