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【单选题】
以下是我们生活中常见的几种现象:1篮球撞击在篮板上被弹回;2用力揉面团,面团形状发生变化;3用力握小球,球变瘪了;4一阵风把地面上的灰尘吹得飞舞。在这些现象中,物体因为受力而改变运动状态的是: A、12;B、14;C、23;D、24A.
错误，第二面团发生了形状变化，不是运动状态变化。
B.
正确，两物体的运动方向都发生了变化。
C.
错误，两物体都是发生形状变化。
D.
错误，第二面团受力发生了形变，不是运动状态变化。
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举一反三
【单选题】Donna can make a chair for about $100, she charges customers $150 to buy the chair, and customers perceive that the chair is worth $225. In this case, the consumer surplus is:
A.
$50.
B.
$75.
C.
$125.
D.
$150.
E.
$225.
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