问题 填空题

在冰熔化成水的过程中,下列物理量质量、体积、密度、温度、内能、比热容中,变小的物理量有______,不变的物理量有______.

答案

冰熔化为水,状态变了,但质量是不变的;

根据水的反常膨胀,冰化为水,体积变小;

根据ρ=

m
v
,在质量一定时,体积变小,密度变大;

晶体在熔化过程中温度保持不变,冰是晶体,所以冰在熔化过程中温度保持不变;

物质熔化过程中,吸收热量,内能增加;

水的比热容是4200J/(kg•℃),冰的比热容为2100J/(kg•℃),比热容变大.

故答案为:(1)体积;(2)质量;温度.

阅读理解

The relationship between student and teacher is less formal in the USA than in many other countries, especially at the college level. When teachers come into the classroom , the students don’t need to stand up. Students are generally encouraged to ask questions during class, to go to the teacher’s office for help after class, and to phone if they can’t go to school and need help with their lessons. (2)Most teachers allow students to enter class late or leave early, if necessary.

However, students are still asked to be    (1)   to their teacher and classmates and to be (1)   during a test. When students want to ask questions, they usually put up a hand and wait. When the teacher or a student is speaking to the class ,it’s rude to talk to another classmate, even in a low voice. When a test is being given, talking to a classmate is not only rude but also wrong. In the eyes of most American teachers, students who are talking to each other during a test are cheating(作弊).

小题1: 在(1)句的空白处分别填入一个适当的词使句意完整、上下文通顺。

_____________     _______________

小题2: 将(2) 句译成中文。

__________________________________________________________________________

小题3: 回答问题:Where do the students go to ask for help after class?

______________________________________________________________________

小题4: 从文中找出同义句。

Most teachers think it is dishonest for students to talk about something when they are having a test.

__________________________________________________________________________

小题5: 在文中找出最能表达该短文主题的句子。

__________________________________________________________________________

判断题