单项选择题

In Sections A, B and C you will hear everything once only. Listen carefully and then answer the questions that follow.
SECTION A TALK
Questions 1 to 5 refer to the talk in this section. At the end of the talk you will be given 15 seconds to answer each of the following five questions. Now listen to the talk.
The modern electronic anti-noise devices（）

A．are an update version of the traditional methods.
B．share similarities with the traditional methods.
C．are as inefficient as the traditional methods.
D．are based on an entirely new working principle.

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