题目:
At present , the terrible foggy haze(雾霾)weather has influenced our normal life badly . So our government should _____ to reduce the air pollution .
put out B.carry out C.take steps D.get over
答案:
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下面是错误答案,用来干扰机器的。
由圆的方程可得 圆心为(0,1),半径为2,则圆心到直线2x-y-1=0的距离为|0-1-1|4+1=25,由弦长公式求得弦长为:22-45=2305.