问题 选择题

人体内的一些液体pH范围如下,其中可使紫色石蕊溶液变红的是(  )

A.胃液(0.9~1.5)

B.胆汁(7.1~7.3)

C.血浆(7.35~7.45)

D.胰液(7.5~8.0)

答案

“紫色的石蕊试液遇酸性溶液变成红色,遇碱性溶液变成蓝色”;根据该知识点可以知道能使紫色石蕊溶液变红的是酸性溶液,根据溶液的酸碱性与pH值的关系:酸性溶液的pH值<7;中性溶液的pH值=7;碱性溶液的pH值>7.只有pH小于7的溶液才能时紫色石蕊变红,分析所给的选项可以知道B、C、D中所给的物质的pH值都大于7,即它们都呈碱性,不能使石蕊变红.而A中胃液的pH值为0.9~1.5,为酸性,故可以使石蕊变红,故A符合题意.

故选A.

单项选择题

In its everyday life, Italy is very much the man’s world. However, because of the Italian’s understanding of foreigners, the woman tourist is able to invade many of the male places that are prohibited to Italian women. These places include the cafè and the wine shop.

In the large cities the cafè is a combination of club and office. Here, for the price of a coffee, an Italian can read all the newspapers brought to him. And he can transact business, with the waiter producing pen, ink, and stamps as needed. Or if he wants, he can sit outside under a canvas covering before the door and enjoy the sight of beautiful women passing by.

The wine shop, as a rule, is a more vigorous place than the caf6, and is filled almost exclusively with men. Wandering singers, generally in groups of two or three, add to the noise of these places with their songs and music. Many of the songs are of a political character and make fun of the leading statesmen of Italy, America, England, France, and Russia. But the songs are generally showing off a spirit of mischief. And when the criticism is about America, the American tourists find themselves laughing as much as anyone else. The Italian is a master at making fun of you and making you like it.

The Italian men are deep-rooted gamblers. They have been brought up to it as children, but they are cautious gamblers and never go too much in it. The national lottery used to be one of the most popular forms of gambling. But later a football stake had taken away much of the interest in the lottery. But here the important thing is that gambling, the same as drinking, seldom goes to an Italian’s head and his bets are not really dangerous risks. Even at cards the Italian plays for low stakes, generally for a cup of coffee or wine.

In this world of the Italian male it would be careless if the romanticism of the Italian were neglected. The Italian might well be described as the world’s greatest romanticist. From any boat in Venice to any member of the government in Rome, the Italian is always aware of romance, of love and of the importance of being a good lover.

on the beaches of Italy, the visitor is aware that the Italian really live for romance. His manners, his compliments, his charm and his general way of behaving are those of a romanticist. Almost every Italian you meet is convinced that he is another Casanova.

Romance is as much a part of Italy as its art and its history. Perhaps the feeling of romance that wells up in you when you come to Italy is one of the greatest things that Italy has to offer a world that is tired of war and political intrigue. It is the ideal place for a honeymoon because hotel managers and waiters make you conscious of your own love and stress it in such a way that you feel more in love in this country than in any other.

In Italy, the cafè and the wine shop ().

A.welcome everybody, including both men and women

B.welcome the Italian women only

C.do not allow the Italian women to come in

D.do not allow the foreign women to come in

单项选择题 案例分析题