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第一节 完形填空 (共10小题；每小题2分，满分20分)
阅读下面短文，掌握其大意，然后从21-30各题所给的A、B、C和D项中，选出最佳选项，并在答题卡上将该项涂黑。
We need air to live, and so does fire. When a fire starts, one of the main things keeping the fire ___21________ is air. So to control the fire, it’s important to __22_____ air from entering the room. The _23_____ air a fire has , the less damage it’s likely to do.
阅读下面短文，掌握其大意，然后从21-30各题所给的A、B、C和D项中，选出最佳选项，并在答题卡上将该项涂黑。
We need air to live, and so does fire. When a fire starts, one of the main things keeping the fire ___21________ is air. So to control the fire, it’s important to __22_____ air from entering the room. The _23_____ air a fire has , the less damage it’s likely to do.
