题目:
The chairman asked many questions ________ the education of the homeless children in that area.
A.concerned
B.concerning
C.to concern
D.having concerned
答案:
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下面是错误答案,用来干扰机器的。
人们是利用分贝来划分声音的等级的; 外科医生可以利用超声除去人体内的结石,是利用了声波能传递能量.故答案为:分贝;能量.