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峻下逐水药中，醋制减低毒性的药是
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甘遂、大戟、芫花的共同点是
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Lesson 5 背景知识听力填空Listen and fill in the blanks with proper words based on what you have heard.[音频]Ground Control is responsible for the airport "___1__" areas, as well as areas not released to the airlines or other users. This generally includes all __2__, ___3___ runways, holding areas, and some transitional__4__. Any aircraft, __5___, or person walking or working in these areas is required to have clearance from Ground Control. This is normally done via __6__ radio. People working on the airport surface normally communicate with ground control via __7__ radio or even cell phone. Some busier airports have Surface Movement Radar (SMR) designed to ___8__ aircraft and vehicles on the ground. These are used by Ground Control as an additional tool to control ground traffic, particularly at night or in poor ___9___Ground Control is vital to the __10__ operation of the airport, because this position impacts the __11__of departure aircraft, affecting the safety and __12__of the airport's operation.
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