________ on the top of the mountain is an ancient tower dating back to hundreds of years ago . A.To stand B.Having stood C.Standing D.Stand 答案:C 解析: 地点状语位于句首,句子用完全倒装。故选C。已知2H2(g)+O2(g)═2H2O(l);△H=-569.6kJ?mol-1,2H2O(g)═2H2(g)+O2(g);△H=+482.1kJ?mol-1.现有1g液态H2O,蒸发时吸收的热量是( )A.2.43kJB.4.86kJC.43.8kJD.87.5kJ