单项选择题

According to the passage, what would happen to us without communication

A．We should learn everything for ourselves.
B．We would become unable to speak.
C．We couldn't live happily.
D．We might have to do everything by ourselves.

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单项选择题

Which of the following statement is true

A．Humans do not have adequate knowledge about animal languages.
B．We are now very much aware of animal languages.
C．Most of animals use their facial expressions.
D．All animals make sounds to communicate with each other.

单项选择题

We were lost at sea, at the ______ of wind and weather.

A．service
B．expense
C．cost
D．mercy