单项选择题

What provides autos with electric power in an automated highway system ______.

A．A rail
B．An engine
C．A retractable arm
D．A computer controller
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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
单项选择题
What do we know about thatching as a craft ______.
A．It is a collective activity
B．It is practiced on farms all over England
C．It is quite different from what it used to be
D．It is in most cases handed down among family members
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