公平理论是由美国心理学家（）提出来的。 A.赫茨伯格 B.马斯洛 C.弗洛姆 D.斯

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How to keep healthy? It’s easy for us to catch a cold in winter and spring because the weather changes a lot in spring and it is too cold in winter. But if we take care in our life, all of us can keep healthy without any cold.
    1    . This will stop germs（细菌,病毒） passing from one person to another. When you finish your work or before you eat, you’d better wash your hands.
    2     . Use a tissue（纸巾）, and then throw it into dustbins at once. When others around you are coughing, I advise you to turn your head away from the people so that their viruses won’t reach you.
Get more fresh air. Germs like staying around in dry and warm rooms.    3    . Don’t stay too long in the places with too many people.
If flu is going round house or school, you should try to stay away from those who are ill.    4   
Boil your toothbrush for about a minute. This kills germs .   5      . If you have used the toothbrush for three months or so, throw it away and buy a new one.

A. Have a shower every day B. Wash your hands often C. Don’t use your hands when coughing   D. Don’t go out often when you are coughing E. Besides, don’t use the same toothbrush too long F. In this way, you won’t be infected by these people G. you’d better stay in the places with more fresh air