题目

--- Can I look at the menu for a few more minutes before I order? --- Of course. ________, Sir. A. Make yourself at home                              B. At your service C. Take your time                                   D. It doesn’t matter 答案：C电视机遥控器可以发出不同的     ，来实现电视机的遥控；适当的     照射有助于人体合成维生素D.(红外线/紫外线)