问题 填空题

现有下列物质:①生石灰 ②工业酒精 ③石墨 ④白醋。请用上述物质的序号填空(每空只填一种)。

⑴ 能使紫色石蕊变红的是          ;    ⑵ 可用作燃料的是          

⑶ 可用于制作铅笔芯的是          ;  ⑷ 遇水放热的是         

答案

⑴④      ⑵②      ⑶③      ⑷①

题目分析:根据常见物质的性质分析。

⑴ 能使紫色石蕊变红的是酸性物质,白醋中含有醋酸,显酸性,故选④;

⑵ 具有可燃性的物质可用作燃料,酒精具有可燃性,故选②;

⑶ 可用于制作铅笔芯的是石墨,故选③;

⑷ 由于氧化钙与水反应会放出大量的热,故遇水放热的是①。

点评:本题主要考查了常见物质的性质和用途等,要求学生能熟记常见物质的性质,及有关的知识点,并能在理解的基础上加以应用。

阅读理解

阅读理解。

      The nervous-looking (紧张不安地) young man had waited for a few moments outside the jeweler's shop

before he got enough courage (勇气) to enter. He was warmly greeted by a young assistant. James felt a rush

blood to his face as he explained he would bring in his future wife to choose a birthday present. The assistant

listened carefully and told him he'd better buy a necklace. He wasn't used to buying jewelry and was a little

worried about overspending. After some discussion as to reasonable price and type, the assistant showed him

dozens of necklaces and helped him to choose. At last James chose one and left the shop promising to return

at five o'clock. When, half an hour later, James did return to the shop with his future wife, Laura, the assistant

acted as if she had never seen him before. When she was asked to show them some necklaces, she first

brought out some inexpensive ones for them to choose and then gave them the one she had prepared. A choice

was soon made and they went away, satisfied. James would certainly come back to buy what he wanted when

he got married.

1. A good title for this passage is _____. [ ]

A. A Clever Assistant

B. Buying a Birthday Present

C. How to Choose a Necklace

D. A Brave Young Man

2. The word "overspending" in this passage means _____. [ ]

A. spending too much money

B. spending too much time

C. spending more time than be planned

D. spending too much time and too much money

3. When James told the assistant why he wanted to buy a present, his face _____. [ ]

A. turned pale   

B. turned red

C. turned yellow   

D. turned black

4. James would come back to buy what he wanted because _____. [ ]

A. the assistant knew how to satisfy the people who came to buy things

B. the necklace was good

C. Laura liked the necklace

D. the assistant who served James was very beautiful

单项选择题