C. The Jerusalem Viruses are a great harm to human health.

　　D. Scientists are trying to find a way to get rid of the viruses

　　第二节（共5小题；每小题2分，满分10分）

　　根据短文内容，从短文后的选项中选出能填入空白处的最佳选项，选项中有两项为多余选项，请将答案写在第二卷的答题框中。

　　People know the dangers of fires. It's good for a family to learn how to prepare for a fire. Here are some suggestions:

　　Put a smoke alarm in the house. Smoke from a fire causes the alarm to go off.

　　71.

　　The sound tells everyone to leave the house at once.

　　Make escape plans. You should know all the ways out of the house. If there is fire, every – one follows the plan to get out. Part of the plan is to check all the windows to make sure they can be opened easily.

　　Buy fire extinguishers (灭火器) in the house. 72.

　　Practise for a fire at home now and then because it can teach children about fire safety. Everyone in the family should know the following fire rules:

　　★73.

　　The fire can grow more quickly if you open the door.

　　★Stay close to the floor! 74.

　　The best air is near the floor because smoke rises.

　　★What will you do if your hair or clothes start to burn? First, stop! 75.

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