听力原文：According to some research, there is still relatively little job mobility in Amer

听力原文：According to some research, there is still relatively little job mobility in American industry.

(22)

A．American workers tend to have a stable job.

B．Crop dusting jobs in American are few.

C．The mob moved very slowly.

D．Their relatives live in a mobile home.

请帮忙给出正确答案和分析，谢谢！

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