题干

化学学习让我们有很多收获.下列归纳和总结完全正确的一组是(             )

A.对化学资源的认识

B.对人物贡献的认识

①可用塑料来代替部分铜制造汽车零部件

②稀土是不可再生的重要战略资源,应合

理利用和保护

①拉瓦锡:定量法测定空气的组成

②张青莲:电解水法测定水的组成

C.对物质俗称的认识

D.对安全的认识

①烧碱、纯碱都是氢氧化钠

②熟石灰、消石灰都是氢氧化钙

①点燃可燃性气体前一定要验纯

②含有亚硝酸钠的工业用盐可以食用

A:A

B:B

C:C

D:D

上一题 下一题 0.0难度 选择题 更新时间:2019-04-16 08:34:12

答案(点此获取答案解析)

A

同类题1

阅读理解

    When was the last time you told someone they inspire you to go to work each morning?

    Teachers at Oak Park High School in Kansas City, Missouri, did just that this September, when they pulled individual students out of class to tell them just how much they appreciated them.

    The students' reactions, which were captured (捕捉) on video and shared on YouTube in a now-viral video, ranged from shy thanks to hugs and tears.

    “I have been challenged to find a student who makes me want to come to school every day,” says one teacher in the video, “and that's you.”

    Jamie McSparin, a teacher in charge of the school's academy program for at-risk sophomores (二年级学生)and juniors, posed the challenge, writes ABC News.

    “Initially when we pulled the kids out, they all thought they were in trouble,” McSparin told ABC News. “Any teacher-student interaction always seems to be negative (消极的), and that was something that bothered me, too. No matter if they're a good kid or a trouble maker or anything, they always thought they were in trouble,” she says.

    McSparin says she got the idea for the project after attending a professional development workshop this summer called the power of positivity.

    “I like the idea of letting students know they are appreciated, because we do appreciate them, I just don't think we say it enough,” she told local news outlet WDAF-TV.

    It's safe to say the challenge was effective.

    “I feel special,” said one of the boys in the video. “You should,” said his teacher. “You are special.”