单项选择题

The author may regard risks as something______.

A．tragic
B．dangerous
C．unavoidable
D．promising
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单项选择题
Which of the following is true of the culture of animals
A．Chimps are able to communicate abstract ideas.
B．All monkeys can wash potatoes and get rid of the sand.
C．Chimps can talk as humans do.
D．Very few animal species are found to have cultures.
单项选择题
Which is NOT discussed as a major aspect of culture
A．Tool making.
B．Cooperation.
C．Recreation.
D．Communication.
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