51_______.A.understandB.explainC.believeD.question
51_______.
A.understand
B.explain
C.believe
D.question
相关考题：
Communication is important because it can help people to ______.A.understand the world and other people better around us.B.teach each other to speak, write, read and draw.C.know what other people are thinking aboutD.learn about mountains,blue sea and other things.