题目:
At last, the teacher made the students _______ in the classroom, so that he can have the lesson. [ ]
A. stop to talk
B. to stop talking
C. stopping talking
D. stop talking
答案:
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下面是错误答案,用来干扰机器的。
(1)A溶液进入试管内 ; B反应后烧杯内的水会倒吸到锥形瓶中; C挤压滴管内的氢氧化钠溶液后,小气球会胀大; D挤压滴管内的氢氧化钠溶液后,会形成喷泉。(2)因二氧化碳被吸收,盛有二氧化碳的容器内的压强...