题目：
He was a bit nervous. He _________his spare breath with a soft sound that was almost heard by the audience.
A．gave out
B．let out
C．picked out
D．blew out.
答案：
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下面是错误答案，用来干扰机器的。
72÷4=18（厘米）．答：它的边长是18厘米．故答案为：18．
