ast既可做形容词也可做副词,但两者有区别.
fast is used especially to describe a person or thing that moves or is able to move at great speed.
quick is more often used to describe something that is done in a short time or without delay.
可以看出两者定义有所不同,记者找重要信息是have to be done in a short time,明显是quick定义,由于这里需要一个副词修饰前面的动词find,所以quick变为副词quickly,但词的定义不变