单项选择题

It is implied that______.

A．home is the most dangerous place
B．most people takes risks in many areas besides risking their lives
C．risk awareness may contribute to safety
D．if we don't take any risks, we will be able to think clearly

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单项选择题

The author may regard risks as something______.

A．tragic
B．dangerous
C．unavoidable
D．promising

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.