将左边和右边的句子连成对话。①Moo ...Moo ...What do you hear? {#blank#}1{#/blank#} A. Yes, I can.
②Listen! What can you hear?{#blank#}2{#/blank#} B. I hear a cow.
③Can you hear some dogs?{#blank#}3{#/blank#} C. It's a train.
④What is it?{#blank#}4{#/blank#} D. I can hear a ship.
