中国宁波籍科学家屠呦呦因发现青蒿素（化学式为C15H22O5，一种用于治疗疟疾的药物）而获得诺贝儿生理医学奖．青蒿素的发现挽救了全球特别是发展中国家数百万人的生命．对青蒿素的叙述，不正确的是_刷题宝

题干

中国宁波籍科学家屠呦呦因发现青蒿素（化学式为C₁₅H₂₂O₅，一种用于治疗疟疾的药物）而获得诺贝儿生理医学奖．青蒿素的发现挽救了全球特别是发展中国家数百万人的生命．对青蒿素的叙述，不正确的是（）

A：是一种有机化合物

B：每个分子中含有42个原子

C：由三种元素组成

D：在这种物质中，碳、氢、氧元素的质量比为15：22：5

上一题下一题 0.0难度选择题更新时间:2019-08-28 01:44:46

答案(点此获取答案解析）

D

同类题1

小红家距奶奶家20千米，她最好步行去。（判断对错）

同类题2

有的同学在学习生活中不敢抛头露面，羞于见人；运动场上老是说“我不行”；碰到困难就“我无招”；一进考场就紧张害怕；面对众人说话就脸红。这些都是

同类题3

阅读下列短文,从每小题所给的A、B、C、D四个选项中选出一个最佳选项。

Reality TV is a type of programme. It means that real-life people, not actors, are followed and filmed in a real situation, or game.

Reality TV is very popular in the UK. At their best, these programmes give us a good look into the lives of different people in Britain. At their worse, they are a very cheap way to make programmes and sometimes involve people behaving very badly.

Here's a selection of some of the UK's reality shows.

Shattered

A group of young people live in a house for a week and must stay awake. Each day there are tests to see how well they can work even though they are totally tired out. They must leave the house if they fall asleep. Viewers vote on those who stay in the house and text their comments (评论) every day.

Come to Dine with Me

Each week four people prepare dinner in their homes for the other competitors. Each competitor then gives the cook a grade out of 10 for the food and entertainment (娱乐). The winner gets a $1,000 cash prize. Sometimes the food is terrible and the competitors are very rude to each other.

World's Strictest Parents

Badly-behaved British teens are sent abroad to live with a super strict family for a week. The teenagers have to follow the rules of their host family and go to the local school. After seven days the teenagers return home and their parents tell us if their behaviour is better. There is often a lot of crying and shouting in this show but it can be pretty funny too.

同类题4

能完成一切生命活动的细胞是（）

同类题5

根据短文内容，选择最佳答案。 Several days ago, I went to my aunt's home and saw my cousin who is studying English linguistics in a university． He showed me his learning materials．Here are two pages of them.

Nice
Generally speaking, the word “nice” is quite an expression of praise. However, back in the late 12^th century, if someone said you were “nice”, it was far from saying good words about you.
Very long ago, “nice” was used to mean “foolish” and “stupid”. That sounds more like the kind of words that would start a fight, not put a smile on someone's face. Later on in the 13^th century, 'nice” came to mean “shy and nervous”. During the 14^th century, it even meant “being careful”. But finally in the 18^th century, it changed to the kinder meaning we know today, and ever since then, people have been using it in a lovable way.

Sad
    All of us get sad from time to time. It's a usual part of life. A loved one passes away. We expect too much progress in an exam. Or the store is out of our favourite drink. These are all things that can make us sad.
    However, once upon a time, “sad” had a very different meaning. Back in the 14^th century, it was the perfect word if you had eaten too much food at dinner.
    Through the years, the meaning of “sad” changed to “heavy” and then “tired”. Interestingly, when “sad” took on its present meaning, it was actually used instead of “unrot”, an old English word that was the opposite of “rot” that meant “cheerful” or “glad”.

Now I know at some point in history, the meanings of some common words that we see every day meant something much different. The English language is developing all the time.

小学学科试题库

初中学科试题库

高中学科试题库