单项选择题

The deep-sea listening system makes use of______ .

A．the sophisticated technology of focusing sounds under water
B．the capability of sound to travel at high speed
C．the unique property of layers of ocean water in transmitting sound
D．low-frequency sounds traveling across different layers of water
<上一题 目录 下一题>
热门 试题

单项选择题
What do we learn from the last paragraph
A．If we focus our attention on one thing, we might forget another.
B．Memory depends to a certain extent on the environment.
C．Repetition helps improve our memory.
D．If we keep forgetting things, we'd better rem to where we were.
单项选择题
What is the passage mainly about
A．The process of gradual memory loss.
B．The causes of absent-mindedness.
C．The impact of the environment on memory.
D．A way of encoding and recalling.
相关试题