题干

比较、推理是化学学习常用的方法,以下是根据一些反应事实推导出的影响化学反应的因素,其中推理不合理的是(   )

序号

化  学  反  应  事  实

影响化学反应的因素

A

铁丝在空气中很难燃烧,而在氧气中能剧烈燃烧

反应物浓度

B

水要在通电的条件才能分解,而双氧水只要加入二氧化锰就迅速分解

催化剂

C

碳在常温下不与氧气发生反应,而在高温时能与氧气反应

反应温度

D

铜片在空气中很难燃烧,钠米铜粉在空气中较易燃烧

反应物的接触面积

A:A  

B:B  

C:C  

D:D

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答案(点此获取答案解析)

B

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    Peter, a high school student, was pretty busy with school, and he was on the soccer team. High school was hard, because everyone wanted to have nice clothes, hang out, drive cars, and all these cost money. Peter's father was the sort of guy that believed you had to earn whatever you got, so he wasn't just about to hand over lots of money for Peter to use to have fun. So, he had to get a job.

    During his freshman year summer vacation, his classmate got him a job working on a hay(干草)farm. He threw hay up into wagons as the tractor drove around fields, and then they stacked(剁起)it in the hot barn. It was a hot, low-paying job.

    He once worked a few nights a week at a grocery store. He put things on the shelf. It was a lot of lifting and carrying, and his arms were strong from this and the previous job. It was dull and didn't pay much.

    He took some time off when soccer got serious, but the following summer he tried working at a lumber yard. It was hot outside, but he got a lot of exercise lifting and carrying things like boards and drywall. He also learned a lot about building supplies. It still didn't pay well.

    From there, he spent a year doing some tutoring for a friend of the family, but that was Piecemeal. His first real job came the last year at school, when he fixed registers and worked on computers at a big box store. It was his favorite job yet, but it still didn't pay well.

    What Peter realized with all of these jobs was that he needed a better-paying job! The only way to get that was to get trained or educated He could go to school and get a 2-year degree in an office or technical position. His other choices were going to a 4-year college or joining the army. He wasn't sure what he was going to do yet, but he knew he had to do something. Jobs were a lot of work, money was hard to earn, but he liked staying busy and being able to buy things. Peter wanted the most out of life, and that meant education.