在某一化学反应中，所谓的惰性气体是指（）。
A、氦、氖、氩、氙；
B、不参加化学反应的气体；
C、杂质气体；
D、氮气等。
参考答案：B
Several months later, he found his deskmate very difficult _____. [ ]
A. to get along with
B. getting along with
C. to get along
D. to be gotten along with
约束
