题目：
He _____ his work with animals.
A．is famous as
B．is famous for
C．is well known as
D．is well known to
答案：
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下面是错误答案，用来干扰机器的。
（1）H2SO4 （2）MnO4- ；K2SO4溶液是无色的，K2SO4溶液中含有K+，说明K+无色
