问题 选择题

甲、乙两种物质的质量m和体积V的关系图象如图所示,则两种物质的密度ρ、ρ的关系正确的是

A.ρ>ρ

B.ρ

C.ρ<ρ

D.无法判断

答案

A

本题考查了密度概念及应用数学函数图象来分析解决物理问题的能力,在具体做题的过程中应注意区分图象的纵坐标是V还是m.由图象可知,当甲、乙的质量相等时,乙的体积大于甲的体积,根据可知,ρ>ρ.故选A.

阅读理解

阅读表达。

     Feeling a little blue? Here are ten fast and easy ways to smile.

     1. Play outside

     Leave your apartment and to outside. Sun and fresh air are good for you.

     2. Exercise

     When _______, your brain releases a chemical called endorphins. This chemical makes you feel happier.

That is just another reason why exercise is good for you.

     3. Have a Heart-to-Heart chat

     If something is bothering you, it is a good idea to talk about it. Call a friend or relative. A good chat is great

feel better fast.

      4. Play Pop Music

      Westlife, Backstreet Boys, S.H.E…who doesn't like a little mindless pop? Listening to upbeat, happy music will make you smile. Singing along won't hurt either.

     5. Laughter is the best medicine

      Laughing is the best way to improve your mood. Children laugh around 400 times a day. Adults only laug

about 20 times a day. What happened? Be a kid for a day: play games, watch funny movies, or read jokes

online.

     6. Power of Chocolate

      Chocolate has special natural chemicals that make you happy. Plus, it tastes so good!

     7. Draw

     Be an artist! Draw, paint, or make something. Even if it is not perfect, being creative relieves stress.

     8. Get a dog

     Dogs are cute (机灵,可爱), energetic, and fun. Plus, studies show that people with pets live longer and

people with dogs live the longest!

     9. Breathe

     If you can't go to the gym, try taking deep breaths. Breathing deeply will relax your muscles and give you

energy.

     10. Think positive

     Close your eyes and think of a beautiful scene of a time when you were happy and feeling good.

1. What is the best title of the passage? (within 10 words)

_______________________________________________________________________________

2. Which sentence in the passage can be replaced by the following one? There are some special chemicals

     in chocolate, and they can make you happy when you feel blue.

_______________________________________________________________________________

3. Please fill in the blank in the paragraph with proper words or phrases to complete the sentence.

    (within  10 words)

_______________________________________________________________________________

4. Which of the ways do you think is the best for you? And why? (within 30 words)

_______________________________________________________________________________

5. Translate the underlined sentence in the paragraph into Chinese.

________________________________________________________________________________

问答题 简答题