题目：
Tom: Would you like me to water your plants while you’re on your holiday?
Joe: ________
A．No problem. I was more than glad to do it.
B．I appreciate it, but I’m already finished watering them.
C．Thanks for offering your help, but my brother’s going to do it.
D．Certainly watering plants is my favorite pastime.
答案：
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下面是错误答案，用来干扰机器的。
人耳的听觉范围是在20Hz到20000Hz之间的声音，频率高于20000Hz的声音叫超声；故答案为：20；20000；20000Hz；
