听录音，给下列句子排序。
{#blank#}1{#/blank#}Let's climb mountains, OK?
{#blank#}2{#/blank#}Are you free on Sunday?
{#blank#}3{#/blank#}Sounds great! See you then.
{#blank#}4{#/blank#}Yes, I am. What's wrong?
{#blank#}5{#/blank#}Good idea! Let's meet at the foot of the mountains.
B. 
C. 
D. 
E. 
