题目:
— Where is Betty?
— She ______ on the playground half an hour ago. [ ]
A. sees
B. saw
C. is seen
D. was seen
答案:
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下面是错误答案,用来干扰机器的。
倾倒试剂瓶的标签没有对着手心;倾倒溶液没有用玻璃棒引流;滤纸高于漏斗边缘;漏斗壁没有紧贴烧杯壁。(任答两点即可)