My mother likes watching TV,because it’s.A.relaxing B.boring C.difficult.

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解析：根据My mother likes watching TV“我妈妈喜欢看电视。”可知，本空应该选电视优点。故用relaxing“令人放松的”。而boring“无聊的”和difficult“困难的”明显与题目不符。所以本题选A。