问题 选择题

生活中的下列现象可以用分子的知识加以解释,其中不正确的是(  )

A.热胀冷缩是因为分子间的距离随温度的变化而改变

B.蔗糖溶解是因为蔗糖分子变小了

C.液氧和氧气都能使带火星的木条复燃,是因为同种物质的分子性质相同

D.打开浓盐酸的试剂瓶,能闻到刺激性气味,是因为分子在不断地运动

答案

A、热胀冷缩是由于微粒之间的间隔在温度变化的情况下发生了变化,导致体积的变化.故解释正确;

B、蔗糖溶解是由于微粒之间存在间隔,混合后微粒相互穿插渗透.蔗糖的微粒运动到了水的微粒之间.故解释错误;

C、液氧和氧气都是由氧分子构成的物质,属于同一种物质的不同状态.同种分子具有相同的化学性质,也说明了分子能保持物质的化学性质,故解释正确;

D、能闻到浓盐酸的刺激性气味是因为含有刺激性气味的分子运动到我们的鼻子之中的缘故,故解释正确.

故选B.

阅读理解

There is a saying that the British like a nice cup of tea in the morning and a nice cup of tea at night. And at half past seven, their idea of heaven is a nice cup of tea. They like a nice cup of tea with their dinner and a nice cup of tea time, and before they go to bed, there is a lot to be said about a nice cup of tea!

Sometime it seems that no one likes tea as much as the British does. But in fact, tea is liked in countries around the world. In China and Japan tea was first used as a medicine, many years later, people there drank tea as a beverage(饮料).

People in the world like to drink different kinds of tea — green, black or red as some people call it. It is served in different ways. But they all know that drinking tea is good for one’s health.

小题1:The main idea of the first paragraph is ______.

A.how many cups of tea the British drink each day

B.that the British like talking about tea

C.that the British can’t live without drinking tea

D.that tea is very important in the life of the British小题2:The phrase “their idea of heaven” means ______.

A.the happiest thing for them

B.their thoughts

C.their God

D.the worst thing for them小题3:The sentence “there is a lot to be said about a nice cup of tea” means ______.

A.they enjoy drinking a nice cup of tea

B.there is a lot of tea

C.they talk much about a nice cup of tea

D.there is a talk while drinking tea小题4:From the passage we know tea was used as a medicine in ______ many years ago

A.the world

B.British

C.many countries

D.China and Japan小题5:This passage mainly tells us ______.

A.people in different countries like drinking different tea

B.something interesting about tea

C.how many kinds of tea there are in the world

D.drinking tea is good for our health

单项选择题