Question

求解，怎么做，帮帮忙，英语大神帮帮忙啊急要啊

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Answer 1

1. There were no electric lamps before Edison invented it.
2. Yes, it is hard to find the materials of a lamp filament.
3. Edison went on doing his experiment.
4. Edison discovered 1200 materials that aren't suitable to be a lamp filament.
5. 有些朋友叫他停止实验，不过他并没有放弃还很竭力寻找材料。