问题 选择题

下列物质中,属于纯净物的是(  )

A.空气

B.海水

C.生铁

D.冰水共存物

答案

A、空气中含有氮气、氧气等气体,属于混合物,故A不符合题意;

B、海水中含有水、氯化钠等物质,属于混合物,故B不符合题意;

C、生铁的主要成分是铁,还含有碳等杂质,属于混合物,故C不符合题意;

D、冰水共存物是由一种物质组成的物质,属于纯净物,故D符合题意.

故选D.

阅读理解

请仔细阅读下面小题中的个人说明,从A 到F的六个选项中,选出符合个人要求的最佳选项,其中一项为多余选项。

小题1:Jeff likes sports and travel. He would like something that can help him

spend boring time on his journey.

小题2: Mrs. Green doesn’t like to exercise, but she likes cooking and reading

books about foreign places. 

小题3:Mr. Dean wants to improve his garden during summer. So he would like something that could help him to do that.

小题4: Lisa , a  22-year-old girl, worries about her weight. She is wondering how to lose weight.

小题5:Sophia likes to look smart. When she is free, she enjoys listening to the music. Now she plans to learn something about music.

A.Learn how to play the guitar. This popular video helps the beginner to become

a guitar player in just 200 hours.

B.Road trips. A program loved by young people, especially those fat girls. Join in it and make yourself become thin.

C.The new pocket MP4. This kind of MP4 fits right into your pocket. It lets you listen to your favorite artist, even when you are on a journey.

D.Singapore. The story of a city. This book is about the history. the culture and the favorite dishes of this small country.E. Spanish in 10 Minutes a Day. A fun, 132-page complete language learning work book. Includes 150 sticky labels: flash cards, a crossword puzzle and more. It is one of the best-selling language series in print.

F. Special scissors(剪刀). This kind of tools will make it easy to deal with flowers and trees. Anyone can learn to use it quickly.

填空题