单项选择题

The whole passage implies that （）

A．only human beings have problem-solving intelligence
B．a person’ s memory is different from a computer’ s in every respect
C．animals are able to solve only very simple problems
D．animals solve problems by instincts rather than intelligence

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单项选择题

Why, according to the passage, did ancient Chinese coins have a square hole in the center（）

A．Because it would be easier to put them together and carry them around.
B．Because it would be lighter for people to carry them from place to place.
C．Because people wanted to make it look nicer.
D．Because people wanted to save the expensive metal they were made from.

单项选择题

57（）

A．a
B．an
C．one
D．another