题干

化学与生活息息相关,通过对化学学习,你认为下列说法正确的是(   )

A:长期饮用纯净水不利于身体健康

B:长期吸纯氧有利于身体健康

C:就地焚烧生活垃圾

D:随意排放生活污水

上一题 下一题 0.0难度 选择题 更新时间:2014-12-06 09:07:20

答案(点此获取答案解析)

A

同类题3

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    For some students, getting better grades can seem like an impossible task sometimes. With the challenges(挑战) of school, just paying attention in class or studying hard isn't always enough. But what if there were other ways for students to improve their grades? For parents and students who have ever wondered if this is possible, now you can rest easy. Research suggests that a person who likes doing activities can improve their grades.

    Scientists think that those students who are active are not just exercising their bodies, but also exercising their brains(大脑). In turn, they can be able to improve their grades at school.

    In the most recent study, researchers found that when children played for half an hour each day, they were better at organizing(组织) their schoolwork as well as doing project work and learning traditionally “difficult” subjects, such as maths.

    What does this mean for children who aren't active? Researchers think that if kids don't get enough activities, they are going to be at a disadvantage when it comes to school performance.

    In the research experiment, a group of children skipped with ropes(跳绳), played basketball and did a number of other games or exercises. Another group of children didn't do any activities. They took part in testing both before experiment and after the experiment. Testing was mainly for maths and reading skills. Results showed that the children in the activity group did better on the tests than those who had no activity.

    All work and no play will not only make Jack a dull(迟钝的) boy, but will also negatively(消极地) affect his grades in school, according to a new study published in the Journal of Pediatrics.

    Parents complain(抱怨) children today are actually less active and they always worry about their grades. Dr. Belton, an expert, said, “If you'd like to see your kids do better in school, have them close their books, set down their pencils and go outside to play.”

同类题4

还原句子。根据材料内容,从方框中选择恰当的句子填入文中空缺处,使短文意思通顺、内容完整。   

    TFK Kid Reporter Dahlia Suiter spoke with the writer of Writer to Writer: From Think to Ink.

    You just said that you didn't think you'd become a writer. Why?

    I didn't know what I would be. There were times when I wanted to be a scientist. I loved reading about biology.

    ①____

    I never thought about writing stories for adults (成年人). It was always for children because when I was a child, books were so important to me.

    ②____

    Revision(修改) is my favorite part. If I can add (增加) something surprising at the same time, I'm happy about that, too.

    ③____

    Writing is hard, and if you're not having fun with it, why do it? "Save ( 保存) what you write" is very important because you may need it. You may need that part you cut.

    ④____

    I hope the book will open up new places to go with writing.

    ⑤____

    Yes. Writing can be a good way to discover (发现) yourself. You learn about yourself when you write. Writing also slows your thinking down, and you can make discoveries and go places that you don't expect.

A. Do you think it's very important for kids to practice writing?

B. What do you hope kids will learn from Writer to Writer?

C. Why did you write "Have fun, and save what you write!" at the end of each part in Writer to Writer?

D. What do you enjoy most about writing?

E. Why do you write children's books?