问题 选择题

下列说法中,不正确的是

A.混合物一定由不同种元素组成 

B.质子数不等的粒子一定属于不同种元素

C.同种元素组成的物质不一定是单质

D.含有氧元素的化合物不一定是氧化物

答案

答案:A

本题考查的是纯净物和混合物的概念,单质与化合物以及氧化物的概念,元素的概念。根据化学概念来考虑,要严格按照定义进行分析。

A、混合物不一定由不同种元素组成,如氧气与臭氧组成的混合物,都是由氧元素组成的不同单质而组成的混合物,故说法错误。

B、元素是具有相同质子数的一类原子,故质子数不等的粒子一定属于不同种元素,故说法正确。

C、同种元素组成的纯净物才是单质,同种元素组成的物质不一定是单质,如上所说的氧气与臭氧,故说法正确。

D、氧化物必须含有两种元素,其中一种是氧元素,故含有氧元素的化合物不一定是氧化物,如碱类物质,故说法正确。故选A

阅读理解

UGG boots have been a winter-weather fashion for several years now, combining function, comfort, warmth and even some style. What many UGG enthusiasts don’t know is that their boots are a breeding ground for bacteria and causes foot problems.

Doctors believe the boots, which are particularly popular among young teenage girls, are leading to a rise in the number of people suffering pains in their feet and knees.

Dr. Ian Drysdale, head of the British College of Osteopathic Medicine, believes because the foot does not get the proper support on the inside, it will lead to more ankle, knee, hip and back problems. “ These boots are not designed for outside wear. Just because something becomes a trend or fashionable doesn’t mean it’s good or right,” he said. “ The particular problem with this type of footwear is that it is unsupported. It is a slipper. You wouldn’t normally expect to be doing outdoor activities from something that’s indoor. If you decide to wear your pajamas outside all the time, someone will come up and say it’s not a good idea.” Dr. Drysdale explained that the feet issues become a particular problem among young teenage girls, whose bones are “plastic” and developing when they are growing. “ If that structure is developing in an inappropriate way,” he said, “then the ultimate structure will be deformed.

UGG Australia, who makes the designer version of the boots, told The Daily Mirror that their boots are “comfort” rather than “performance” footwear and consumers should be aware of “knockoffs(仿制品)” which lack reinforce heels in their boots.

小题1: Teenage girls prefer to wear UGG boots because of the following except__________.

A.design

B.comfort

C.quality

D.warmth小题2:According to Dr.Ian Drysdale,____________.

A.there is a possibility that bacteria will multiply in UGG boots

B.wearing UGG boots will lead to more ankle and toe problems

C.it’s not a good idea to wear boots like UGG outside all the time.

D.teenage girls’ bones are plastic enough to wear UGG boots小题3: The underline word “deformed” is closest in meaning to_______.

A.shaped

B.strengthened

C.reformed

D.damaged小题4:Which of the following can be the best title for the text?

A.Potential Harm of UGG Boots

B.The Popularity of UGG Boots

C.The Unique Design of UGG Boots

D.Benefits of UGG Boots

单项选择题