题目

When the six very best students from different cities in Guangdong province all together chose universities in Hong Kong; when the very best student of Beijing picked up HK University while giving up the nearby Peking or Tsinghua University; when the highest enrollment(录取) rate of Hong Kong Science and Industry University reached 48:1, it’s the high time to ask where the real education heaven for students in China is. Years ago, the answer certainly would be “Peking or Tsinghua University”. But now no one could give the exact reaction without hesitation. The only sure thing is that H有下列四个命题：①“若x+y=0，则x，y互为相反数”的逆命题；②“全等三角形的面积相等”的否命题；③“若q≤1，则x2+2x+q=0有实根”的逆命题；④“不等边三角形的三个内角相等”的逆否命题；其中真命题的序号有（　　）A．①②③B．①③④C．①③D．①④