题目内容
33. He needs to spend time on his homework, (spend time on)
造句：这道数学题花了我两个小时。_
33. I spent two hours on this maths problem.
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请根据表格内容写一篇文章介绍下面几种生活用品。
Invention | Time | Who | Uses |
digital camera | 1975 | Steven J. Sasson | take photos |
telephone | 1876 | Alexander Bell | communicate |
radio | 1895 | Guglielmo Marconi | listen to news and music |
There are many inventions that have caused great changes in the world. Here’s a short introduction. For example，the digital camera was invented by_