【题目】Tourists should keep in mind that they are representing their motherland while abroad, so they need be _______ about their behaviour.
A. envious B. cautious C. previous D. precious
在线课程【答案】B
【解析】
考查形容词辨析。句意：游客应该记住，他们在国外代表着他们的祖国，所以他们需要小心自己的行为。A. envious嫉妒的；B. cautious小心的；C. previous早先的；D. precious宝贵的，故选B。