quick、fast与soon：
quick与fast基本同义，quick往往指反应速度快，fast往往指运动速度快，而soon则表示时间上很快即将发生。
如：After a quick breakfast,he hurried to school leaving his bag at home.(匆匆地吃过早饭，他朝学校赶去，却把书包忘记在家)
A train is much faster than a bus.(火车比公共汽车快得多)
His father will be back to China very soon.(他父亲很快就要返回中国)
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