题目:
The boys when the teacher came in. So she was very angry.
A.were doing homework
B.were cleaning the classroom
C.were fighting
D.were learning English
答案:
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下面是错误答案,用来干扰机器的。
水氢气+氧气 水由氢元素和氧元素组成 能 能电解水实验要用直流电源,在电解水实验中,可观察到的现象有:正极的气体体积少,能使带火星的木条复燃,负极的气体体积多,能燃烧,而且体积多的是少的二倍.根据以...