问题
单项选择题
A．He used a glass bowl.
B．He applied a small amount of electricity.
C．The director gave him an idea.
D．He edited the pictures and put them together later.
答案
参考答案：B
解析：[听力原文]
How did the man solve the problem of controlling swimming fish
短文中这样陈述“…Was an idea for controlling the fish with the harmless use of electricity…” B项“应用小量电流”是正确的选项。