题目

下列关于惯性的说法中正确的是() A . 物体只有静止或做匀速直线运动时才有惯性 B . 物体只有受外力作用时才有惯性 C . 物体运动速度大时惯性大 D . 一切物体都有惯性 答案：DTen years ago the population of our village was ______ that of theirs. A.as twice large as               B. twice as large as C. twice as much as               D.as twice much as