工艺系统在（）作用下，将产生相应的变形和振动。
A.切削力
B.摩擦力
C.惯性力
D.重力
参考答案：A, C, D
下列句子朗读起来不太顺口，请稍加修改，使之通顺。
我想起红布似的高粱，金黄的豆粒，土地黑色的，红玉的脸庞，眼睛似黑玉，斑斓的山雕，奔驰的鹿群，带着松香气味的煤块。
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—What have you done with my cat?
—I'm terribly sorry.I've ________ it.Believe me, it's an accident.But I'd like to pay for it.
A．run after
B．run over
C．run through
D．run across
