题目

为了测定某额定功率为1000w的电热水器的效率，物理兴趣小组的同学在热水器中加了2kg的水，让热水器正常工作，并绘制出通电加热过程中水温随时间的变化情况图，水的比热容C=4.2×103J/( kg•℃)求：(1)加热2min，水的温度升高了多少℃? (2)加热6min，水吸收了多少热量?(3)电热水器的效率是指水吸收的热量与电热水器放出的热量之比，该热水器正常工作时的效率为多少?The naughty boy,who starved _____ a CD,  said seriously to  his father that he would starve_____ death rather than give  up his demand.        [     ]A. for; to        B. for; till      C. about; until D. after; to