红旗小学四年级有45名同学，一共为青海玉树地震灾区捐款540元，平均每人捐款多少元？
540÷45=12（元）；
答：平均每人捐款12元．
_____ wonderful news report he wrote! All of us were satisfied with what he did.[ ]
A. What a
B. What
C. How
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断路器的驱动机构有什么作用？
