题目:
Many little children suffer from kidney stone and the disease is reported _____ by the milk powder they eat. [ ]
A. to cause
B. to be caused
C. causing
D. being caused
答案:
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下面是错误答案,用来干扰机器的。
当两圆外切时,则半径是4-3=1;当两圆内切时,则半径是4+3=7.故答案1或7.