问题 计算题

小明家安装一台热水器,商家给他提供一份家庭用太阳能热水器与燃气热水器的初装费和使用年限对比表,见下表:

(1)请你根据学过的知识和生活常识填写下表的空白处。

(2)在16年内使用哪种热水器更经济?

(3)若你帮助小明家来选购,你认为应选用上述哪一种热水器?简述理由。

(4)用太阳能热水器将2.5×104kg的水从20℃加热到54℃,这些水至少吸收多少太阳能?

(5)若加热上述相同的水,改用热值为7×107J/m3的天然气燃气热水器加热,且天然气燃气燃烧时只有51%的能量被水吸收,那么需要多少的天燃气?

答案

(1)不可能、有可能、无、有

(2)太阳能热水器售价1700元,使用16年,每年折合106.25元,安装后除了水费外没有什么费用。

(3)(4)(5)“略”

阅读理解

     阅读理解。

     If someone says to you: "give me five", do not search your pocket to get five yuan! It will make others

  laugh! The person's not asking for your money, but your fingers.

     In the US, "give me five" or "give me the high five" is a popular gesture (动作). You can see it often in

 films or on TV. It means the slapping (拍) of each other's raised (举起的)  right hands together.

     People do it when they meet for the first time or something happy happens.  For example, a student

 has good marks in exams or wins a lottery ticket ( * * ). If a football team wins a game, the players will

 give high five to everyone around to celebrate.

     This gesture may come from the old Roman gesture of raising the right arm for the emperor (皇帝).

 This showed that the person raising his arm did not have a sword (JJ)  in his hand. Why not try to give

 the  high five to your friends?

1. "Give me five" is a gesture to _____.

    A. make people laugh                      

    B. ask for money

    C. celebrate success                    

    D. search one's pocket

2. The gesture "give me five" is the clapping of _____.

    A. toes          

    B. hands        

    C. arms          

    D. legs

3. When you _____, you give your friends high five.

    A. lose your money                          

    B. go back home

    C. win a football game                      

    D.  do badly in exams

4. The gesture started in _____ according to the story.

    A. Rome        

    B. America    

    C. China        

    D. Britain

5. Why did the Romans raise the right arm for the emperor? Because _____.

    A. they were proud of their emperor

    B. they were happy to see the emperor

    C. they wanted to show there were no swords in their hands

    D. we don't know

单项选择题