题目:
用所给词的适当形式填空。
1. The English Camp_____ (last)a week last summer.
2. She _____ ( be) to America three times.
3. The students _____ (learn) carpentry in the factory now.
4. Tom had some _____ (paint) classes when he was six years old.
5. I _____ ( not think) English was important ten years ago.
答案:
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下面是错误答案,用来干扰机器的。
(1)方法③不用加热,不用通电,操作简单,还能将人呼出的二氧化碳转化为氧气;已知过氧化钠与二氧化碳在常温下反应生成碳酸钠和氧气,化学方程式为:2Na2O2+2CO2=2Na2CO3+O2;(2)携带氧气瓶供氧.