单项选择题

Why do local Cantonese learn Mandarin()

A．For international trade.
B．To go to the mainland.
C．For the reintegration.
D．For the development of their business.

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单项选择题

We know very little about the central Africa 200 years ago because()

A．there was nothing worth being written down at that time
B．the people there ignored the importance of keeping a record
C．the written records were perhaps destroyed by a fire
D．the people there had not known how to write

单项选择题

Remembered history is regarded as valuable only when()

A．it is written down
B．no written account is available
C．it proves to be true
D．people are interested in it