题目

阅读理解;阅读下列短文，从每题所给的A、B、C、D四个选项中，选出最佳答案。Do you like playing badminton? Do you know Lin Dan—a famous Chinese player? We Chinese often call him “Super Dan”．Are you a fan of him?On October 14, 1983, Lin Dan was born in Fujian．He began to play badminton when he was very young．Now he has become the top badminton player in the world．On August 11, 2014, he beat the 31-year-old Lee Chongwei from Malaysia at the World Badminton Championship．Lin won this prize for the fifth time．It was not an easy win．Before the game, Li下列说法正确的是（　　） A、在常温下，放热反应一般能自发进行，吸热反应都不能自发进行B、NH4HCO3（s）═NH3（g）+H2O（g）+CO2（g）△H=+185.57 kJ?mol-1，能自发进行，原因是体系有自发地向混乱度增加的方向转变的倾向C、因为焓变和熵变都与反应的自发性有关，因此焓变或熵变均可以单独作为反应自发性的判据D、在其他外界条件不变的情况下，使用催化剂，可以改变化学反应进行的方向