问题 选择题

化学无处不在,用你所学的知识判断下列说法中不正确的是

A.用食醋可除去热水瓶中的水垢

B.空气中二氧化碳含量的增加导致酸雨的形成

C.天然气管道泄漏,随时有爆炸的危险

D.用肥皂水检查液化石油气罐是否泄漏

答案

答案:B

A、食醋的成分为醋酸,具有酸的性质,能与水垢中的成分碳酸钙和氢氧化镁反应生成易溶于水的物质,从而将水垢除去,故A内容正确,不选;

B、少量酒精能促进血液循环,酒精量多时易引起神经麻痹,故B内容错误,选B;

C、天然气的主要成分是甲烷,属于易燃性气体,不纯易引起爆炸,内容正确,不选;

D、液化气罐泄露的气体能将肥皂水吹起气泡,可以使用肥皂水检查液化石油气罐是否泄露,内容正确,不选;

故选B.

单项选择题
阅读理解

阅读理解。

     Today we will talk about expressions with "apple". "Apple pie order" means very well organized.

Nobody is sure when and where this expression began. It is said that the women of New England loved

to have everything in its place, especially when they were making apple pie.

     Another expression "apple of discord" describes the opposite condition. The ancient story says that

all the gods and goddesses were celebrating a marriage when Discord, one of the gods, threw a golden

apple on the table which was to be given as a prize to the most beautiful goddess. How could they

choose among Juno, Minerva and Venus? When Paris decided to give the golden apple to Venus, Juno

and Minerva were very angry and threatened(威胁)him. This began the long Trojan War.

     Calling a tomato "a love apple" was a mistake. In the sixteenth century, Spain imported the tomato

from South America to Morocco, and then Italian businessmen took it to Italy. The Italian name for the

tomato was pomo di Moro-apple of the Moors(荒野). When French growers imported it from Italy,

they thought di Moro meant d'amour, the French word for love. And so pomo di Moro became the

apple of love.

     People believe many things about the apple. One belief is that it has great powers of keeping people

healthy. "An apple a day keeps the doctor away." Another belief is based on fact. "One rotten apple

spoils the barrel." The expression has come to mean that one bad person in a group can cause everyone

to act badly.

1. Which of the following expressions means badly organized?

A. Apple pie order.

B. Apple of discord.

C. An apple a day keeps the doctor away.

D. One rotten apple spoils the barrel.

2. Which of the following statements is WRONG?

A. Discord is the name of a god.

B. Di Moro means love in Italian.

C. "Apple pie order" means very well organized.

D. Many people believe apples can keep them healthy.

3. We can most probably hear this passage in a radio program about ______.

A. famous people in America

B. traveling in America

C. eating in America

D. words and their stories