单项选择题

According to the passage, it can be inferred that the Greeks and Romans ______.

A．also developed the toothbrush
B．were the first to support artificial teeth
C．had more dental problems than other cultures
D．did not keep records of their dental practices
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单项选择题
According to the entry, which of the following sentences is are correct (1) People here prefer to tide their own bicycles than riding the town buses. (2) People here prefer riding their own bicycles than riding the town buses. (3) People here prefer tiding their own bicycles to riding the town buses. (4) People here prefer to ride their own bicycles to to ride the town buses.
A．They are all correct.
B．They are all correct except (4).
C．Both (2) and (3) are correct.
D．Only (3) is correct.
单项选择题
The development of modem communications technology in developing countries may______.
A．hinder their industrial production
B．cause them to lose control of their trade
C．force them to reduce their share of exports
D．cost them their economic independence
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