单项选择题
A．ask if there're anyone free to help you B．make a general request during a meeting C．ask the specific person for help directly D．seek for volunteers in your colleagues
A．dictionaries completely cover the words we can make use of B．"schoolroom" is used in the passage as an example of a specialized term C．once you know how a word is pronounced and what it represents, you have turned it in-to your active vocabulary D．active vocabulary refers to words we understand when we read and hear them
A．less often used than his active vocabulary B．smaller than his active vocabulary C．as large as his active vocabulary D．much larger than his active vocabulary