单项选择题

Scientists are beginning to understand that men are different from animals because ________.

A．they can think and learn
B．they can speak
C．they can use computers
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单项选择题
Scientists do not know ________.
A．how children learn their own languages
B．when children begin to learn their own languages
C．why children learn their own languages
单项选择题
We need fire because it helps us _________.
A．kill animals and burn forest
B．warm house, cook food and so on
C．build bridges
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