题目

等差数列中，，那么方程根的情况（    ） A、没有实根         B、两个相等实根     C、两个不等实根    D、无法判断 答案：A __________ about wild plants that they decided to make a trip to Madagascar for further research.A．So curious were the coupleB．So curious the couple wereC．How curious the couple wereD．The couple were such curious