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.

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单项选择题

We can infer from the passage that the oldest form of communication between people is ______.

A．speech
B．touch and heating
C．sounds
D．body language

单项选择题

What does the passage say about animals' communication

A．They have their advanced language in form of sound.
B．They can express simple feelings such as hunger and pain.
C．Some of them can communicate with people very well.
D．All of them can use sound to express themselves.