单项选择题

Questions 14-17 are based on the following monologue. You now have 20 seconds to read Questions 14-17. After his initial discovery, what did Fleming do

A．He returned to his routine work.
B．He developed penicillin further.
C．He kept a supply of the mould.
D．Both A and C.

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单项选择题

单项选择题

Questions 14-17 are based on the following monologue. You now have 20 seconds to read Questions 14-17. After his initial discovery, what did Fleming do 您的浏览器不支持 audio 元素。