搜题请搜索小程序“爱下问搜题”
问题 单项选择题

在气相色谱中，由于各组分在（）上的差异，与固定相发生作用的大小、强弱也有差异，在同一推动力作用下，不同组分在固定相中滞留时间有长有短，从而按先后不同的次序从固定相中流出。

A、性质

B、结构

C、浓度

D、性质和结构

答案

参考答案：D

阅读理解

阅读短文，根据短文内容选择正确的答案。

Coffee has become the most popular American drink. Today people in the United States drink more coffee than（比）people in any of the other countries. People drink coffee at breakfast, at lunch, at dinner, and between meals. They drink hot coffee or coffee with ice in it. They drink it at work and at home. They eat coffee ice-cream and coffee candy（糖果）. Coffee is black and very strong. Different people like to drink it in different ways. Some people like coffee with cream or sugar in it. Other people like coffee with both cream and sugar in it. In all ways it is served（提供服务）. Coffee has become an international（国际的）drink.

小题1:Coffee is an ________ drink.

A．interesting

B．international

C．ice-cream

D．America小题2:Different people like to drink coffee __________.

A．at work or at home

B．in different ways

C．with cream or sugar

D．between meals小题3:Today Americans drink ____ coffee than people in any of the other countries.

A．as much as

B．less

C．more

D．most小题4:“Coffee is black and very strong.” The word strong here means ______.

A．坚固的

B．淡的

C．强壮的

D．浓的小题5:_____ is the most popular American drink.

A．Black tea

B．Coffee

C．Water with ice

D．Whisky
查看答案
填空题

长颈鹿的寿命是（）年。
查看答案