在温度不高时，刀具磨损以下列那种原因为主（）
A、硬质点磨损
B、粘结磨损
C、扩散磨损
D、化学磨损
参考答案：A
— David has gone to Australia on business.
— Really? I ______ why he was absent from today's meeting.[ ]
A. am wondering
B. wonder
C. was wondering
D. had wondered
发行人及其承销商违反规定向参与认购的投资者提供财务资助或者补偿的，中国证监会可以责令改正。（）
