题目

The child tiptoed quietly to the bird. ____ into the forest when he was about to catch it. A . Flew it away B . Away flew it C . Away it flew D . Flew away it 答案：C下图是可逆反应A+2B  2C+3D的化学反应速率与化学平衡随外界条件改变（先降温后加压）而变化的情况，由此可推断A．正反应是放热反应B．若A、B是气体，则D是液体或固体C．逆反应是放热反应．D．A、B、C、D均为气体