They use computers to keep the traffic _______ smoothly. A. being run B. run C. to run D. running 答案:D 解析:考查非谓语动词Ving,这儿构成(keep sth. doing。)。根据碘与氢气反应的热化学方程式(i) I2(g)+ H2(g) 2HI(g) △H="-9.48" kJ/mol (ii) I2(s)+H2(g)2HI(g) △H="+26.48" kJ/mol下列判断正确的是( )A.254g I2(g)中通入2gH2(g),反应放热9.48 kJB.1 mol固态碘与1 mol气态碘所含的能量相差17.00 kJC.反应(i)的产物比反应(ii)的产物稳定D.反应(ii)的反应物总能量比反应(i)的反应物总能量低