When it es to second hand cars, one has to be as as possible about the source and the condition of them.
A. cautious
B. patient
C. urgent
D. casual
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(答案→)A. cautious
B. patient
C. urgent
D. casual
解析：词义辨析。 A．谨慎的 B．耐心的 C．紧急的 D．随便的。句意：当涉及到二手汽车，一个人必须对车的来源和他们的状况尽可能的谨慎点。故选A。