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.

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单项选择题

______ both sides accept the agreement ______ a lasting peace be established in this region.

A．Only if, will
B．If only, would
C．Should, will
D．Unless, would

单项选择题

The largest system serving e-mail messengers is the Internet, a ______ of millions of computers linked worldwide.

A．unity
B．combination
C．network
D．connection