材料一：

材料二：在1750至1770年之间，英国的出口产品增长了80%。英国拥有商人的航海能力，它能够把货物运送到世界各个地区。英国的企业家和发明家抓住了这个机会。1773年凯伊发明的飞梭，通过相对简单的机械装置提高了织布速度。之后，技术不断更新，最后进一步发展成为用蒸汽驱动的装置。这时，制造厂的厂房就可以建立在企业家认为合适的地方。

——整编自罗伯特·E·勒纳《西方文明史》

判断火柴燃烧是化学变化的主要依据是(    )

小刚在做“探究凸透镜成像”实验，所用凸透镜的焦距为10cm且位置固定．

短文改错。

Our school held an English speech contest each year. Han Meimei won the first prize in last year. Everyone was sure that she was going to the champion again this year. Yet, to our surprise, she, instead getting the first prize, coming out second in the end. When the judge at the contest announced the results, Han Meimei felt so sadly that she almost cried. Therefore, she was not discouraged. When the second prize was given to her, she said to her, “The prize is not of important. I am going to work still hard to improve my English speaking ability.

____ ____ ____ ____ ____ ____ ____ ____ ____ ____