Although it takes up much of his spare time, Mr. Smith finds stamp collecting ex

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问题 Although it takes up much of his spare time, Mr. Smith finds stamp collecting extremely ______.

选项 A、progressive
B、encouraging
C、rewarding
D、challenging

答案 C

解析 progressive“进步的；前进的”；encouraging“鼓励的”；rewarding“有回报的，值得做的”；challenging“挑战的，引起争论的”。

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