问题 问答题

质量为200g的铝锅里装有质量为1kg的水,要把25℃的水烧开,铝锅和水共吸收多少热量?[C=0.88×103J/(kg•℃)].

答案

铝锅吸收的热量为Q=cm△t=0.88×103J/(kg•℃)×0.2kg×(100℃-25℃)=1.32×104J,

水吸收的热量为Q=cm△t=4.2×103J/(kg•℃)×1kg×(100℃-25℃)=3.15×105J,

那么铝锅和水共吸收的热量为Q=Q+Q=1.32×104J+3.15×105J=3.282×105J,

答:铝锅和水共吸收的热量为3.282×105J.

阅读理解

阅读理解。

     Do you like chocolate? Maybe most people do. A box of it can be a great gift. Buy one for a friend and

give it as a surprise. See how happy that person gets.

     Say you just got a box of chocolate. Which piece do you pick first? A man has studied people's choices.

He says they tell something about the person. Did you choose a round piece? You are a person who likes to

party. Did you choose an oval (椭圆形的) shape? You are a person who likes to make things. Picking a

square shape shows something else. The person is honest and truthful. You can depend on him or her.

     What kind of chocolate do you pick? Maybe you like milk chocolate. This shows you have warm feelings

about the past. Dark chocolate means something else. A person who chooses it looks toward the future. What

about white chocolate? Would you choose it? If so, you may find it hard to make up your mind. Some people

like chocolate with nuts (果仁). These are people who like to help others. 

    Do you believe these ideas? Can candy tell all these things? It doesn't really matter. There is one sure thing

about eaters of chocolate. They eat it because they like it.

1. This passage mainly tells us ______. [ ]

A. why people like chocolate

B. almost everyone likes chocolate

C. about different kinds of chocolate

D. different choices may show different characters

2. Picking a round shape of chocolate shows that a person ______. [ ]

A. likes singing, dancing and drinking

B. likes to do something for others

C. is good at making things

D. can be depended on

3. If you enjoy eating milk chocolate you may ______. [ ]

A. look forward to the future

B. like to think of the past

C. enjoy parties and fun

D. have trouble making decisions

4. From this passage we can say that a helpful man may choose chocolate ______. [ ]

A. in oval shape

B. in square shape

C. with nuts

D. with coffee

5. The last paragraph suggests that the writer ______. [ ]

A. believes all the information about chocolate

B. does not believe the information about candy

C. is trying to get you to believe false information

D. doesn't think it important whether you believe the ideas

填空题