问题 选择题

(6分)下列说法正确的是(   )。

A.两个物体只要温度相等,那么他们分子热运动的平均动能就相等;

B.在自然界能的总量是守恒的,所以不存在能源危机;

C.热力学第一定律也可表述为第一类永动机不可能制成;

D.热力学第二定律可描述为“不可能使热量由低温物体传递到高温物体”;E.1kg的0oC的冰比1kg的0oC的水的内能小些

答案

ACE

题目分析:温度是分子热运动的平均动能标志,两个物体只要温度相等,那么他们分子热运动的平均动能就相等,A选项正确;虽然在自然界能的总量是守恒的,在能的转化和转移具有方向性,所以B错;热力学第一定律也可表述为第一类永动机不可能制成,C正确;热力学第二定律可描述为“不可能使热量由低温物体传递到高温物体,而不引起其它的变化”D错;1kg的0oC的冰变成1kg的0oC的水要吸收热量,所以E选项正确。

阅读理解

阅读理解。

     There are four people in my family. They're my grandfather, my parents and me. My grandfather

exercises every day. He never surf the Internet. He eats vegetables three times a day, but he hardly ever

drinks milk. And he watches TV every night. My father is a taxi driver. He's very busy. He never exercises, but he sometimes surf the Internet. He watches TV on Saturday and Sunday evening. He often eats

vegetables and drinks milk. My mother is a housewife (家庭主妇). She watches TV twice a day. She

never surf the Internet. She sometimes eats vegetables, but she drinks milk three times a week. Exercise? Of course she does. She exercises every day by doing housework. I'm a middle school student. I go to

school from Monday to Friday. I often exercise. But on Saturday and Sunday, I don't exercise because

I have too much homework to do. I watch TV only on Sunday evening. But I surf the Internet twice a

week. I drink milk every day, but I don't like vegetables. My mother often says to me, "Why do you eat

so much meat, Mike? It's not good for your health." But I like it very much.

1. _____ sometimes surf the Internet in his family. 

A. Mike and his father  

B. Mike and his mother 

C. Mike's parents      

D. Mike's father and grandfather

2. _____ watch TV every day in his family. 

A. Mike and his grandfather  

B. Mike's mother and grandfather 

C. Mike's parents    

D. Mike's father and grandfather

3. What does Mike's father do? 

A. He often eats vegetable.  

B. He sometimes surf the Internet. 

C. He is very busy.        

D. He is a taxi driver.

4. Why don't Mike exercise on Saturday and Sunday? 

A. Because he wants to surf the Internet. 

B. Because he wants to watch TV. 

C. Because he has too much homework to do. 

D. Because he has to go to school.

5. Mike likes eating _____ very much.

A. meat    

B. vegetables  

C. fruit  

D. milk

单项选择题