停产大修的特点是（）。
A.时间紧、任务重
B.时间宽松、任务重
C.时间宽松、任务轻
D.时间紧、任务轻
参考答案：A
The chairman asked many questions ________ the education of the homeless children in that area.
A．concerned
B．concerning
C．to concern
D．having concerned
关于单纯骨软骨瘤，下列哪项不符合( )
A．多见于年轻人，多发生于干骺端
B．治疗可采用手术切除
C．一般生长年龄结束后肿瘤停止生长
D．为预防恶变，确诊后行截肢治疗
E．单发性骨软骨瘤比多发性恶变机会少
of the homeless children in that area.