单项选择题

The main idea of this passage is that ______.

A．man's elementary number sense is found in lower species
B．birds have a limited number sense
C．animals cannot count
D．number sense is a primitive form of counting

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单项选择题

It can be inferred from the passage that ______.

A．international trade should be expanded
B．the interests of the poor countries have not been given enough consideration
C．the exports of the poor countries should be increased
D．communications technology in the developing countries should be modernized

单项选择题

From the passage we know that the development of high technology is in the interests of ______.

A．the rich countries
B．scientific development
C．the elite
D．the world economy