单项选择题

What is the main idea of last two paragraphs

A．The difference and resemblance of using language between human beings and animals.
B．The function of language.
C．How the human beings produce the sound.
D．Humans are characterized in many ways to use symbolic communication.

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单项选择题

Which of the following can be the best title of the article

A．New mission—repairing the International Space Station
B．Second spacewalk ends after mishaps
C．New crew to inhabit the station
D．Endeavours' new flight

单项选择题

It can be inferred from the text that_____.

A．the main aim of the spacewalk was not accomplished
B．the final repairing work depends on future
C．the spacewalk cost much
D．repairing work has finished