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问题 多项选择题

饭店开展绿色营销的原则主要有()。

A．再使用

B．再循环

C．减量化

D．减质化

E．找替代

答案

参考答案：A, B, C, E

选择题
如图所示，在x轴上方存在着垂直于纸面向里、磁感应强度为B的匀强磁场，一个不计重力的带电粒子从坐标原点O处以速度v进入磁场，粒子进人磁场时的速度方向垂直于磁场且与x轴正方向成120°角，若粒子穿过y轴正半轴后在磁场中到x轴的最大距离为a，则该粒子的比荷和所带电荷的正负是（　　）

A．，正电荷

B．，正电荷

C．，负电荷

D．，负电荷
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填空题
选词填空。用方框中所给单词的适当形式填空，使短文通顺、正确、连贯（每个单词限用一次）。
    it           can        close         try        on         treat        do         give          time             if
     A dog 1____ speak any words, but it can “talk”. It has feelings just as you do. At 2____  it may feel
angry or afraid. Watch a dog 3____ , and you can find out how it feels. You can see what it is 4____  to
tell you. When you are afraid, you may look down. When a dog is afraid, it may run away. When you are
angry with other people, you stare at them and so 5____  an angry dog. Sometimes the hair along 6____ 
back stands up.
     Do you feel guilty when you have done something you shouldn't do? Dogs can feel guilty, too. At
times when I come home, I'm 7____  a guilty look by my dog. Then I know he has done something wrong.
     Dogs need love and attention. Some dogs are very unhappy when they are left alone for a long time.
Some dogs even snap 8____  they don't get enough attention.
     You may have a dog or you may know a dog. 9____  it well if you want to have fun with it. Play with it.
Take it 10____  walks. Try not to punish it one time and not the next for doing the same thing. Always
remember, a dog has needs and feelings just as you do. Talk to a dog, and it will talk to you .
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