单项选择题

The underwater listening system was originally designed______ .

A．to trace and locate enemy vessels
B．to monitor deep-sea volcanic eruptions
C．to study the movement of ocean currents
D．to replace the global radio communications network

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热门试题

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.

单项选择题

Why does the author think that encoding properly is very important

A．It helps us understand our memory system better.
B．It enables us to recall something from our memory.
C．It expands our memory capacity considerably.
D．it slows down the process of losing our memory.