下列哪项不属于有氧训练的内容（）
A.步行
B.骑自行车
C.游泳
D.举重
E.登山
参考答案：D
若（b+1）2+3|a-2|=0，则a-2b的值是（ ）
A．-4
B．0
C．4
D．2
Mr. Kramer, the losing candidate in a two-candidate election, received 942, 568 votes, which was exactly 40 percent of all the votes cast．Approximately what percent of the remaining votes would he need to have received in order to have won at least 50 percent of all the votes cast ？（）
A．10%
B．12%
C．15%
D．17%
E．20%
