题目

下列运算正确的是（ ） A . （﹣a2）3＝﹣a5 B . a3•a5＝a15 C . a5÷a2＝a3 D . 3a2﹣2a2＝1 答案：CThe rising house price has become the biggest ______ of the ordinary people in China today.A．concernB．influenceC．figureD．loss