77. 【解析】How。根据表格右栏内容及第四段“The experts say the most effective way to wash your hands. . . ”可得出答案。

　　78. 【解析】soap。根据第四段“The experts say the most effective way to wash your hands is to rub them together while using soap and warm water. ”可得出答案。

　　79. 【解析】seconds。根据第四段“Be sure to rub all areas of the hands for about ten to fifteen seconds. ”可得出答案。

　　80. 【解析】germs。根据第三段第一句“Hand-washing destroys germs from other people, animals or objects a person has touched. ”可得出答案。

　　书面表达

　　【参考范文】

　　In the picture, two goats are tied to each other with a rope. They both see some grass in opposite directions, and try to pull to get their own food. They are unsuccessful because the rope is too short to allow them to eat the food at the same time.

　　The picture is trying to tell us that cooperation is better than conflict. Both of the goats want their food at the same time, which has formed a conflict between them. However, if they decide to cooperate and eat the grass on the left first, and then the grass on the right, they will both be able to get their food. Thus things will turn into a “win-win” situation.

　　In conclusion, sometimes our goal is not that we get something and the other gets nothing, but that all people get what they want. If we are to succeed, cooperation plays an important role and will benefit both sides. Therefore, it’s essential that we should attach more importance to teamwork and cooperation in what we do.

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