单项选择题

Which of the following statements 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 the animals make sounds to communicate with each other.

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单项选择题

Classified advertising is different from display advertising because ______.

A．all advertisements of a certain type are grouped together
B．it is more distinguished
C．it is more expensive
D．nowadays the classified advertisements are all of the same size

单项选择题

What does the writer say about the classified advertisements that used to be put in the papers

A．They used to be voluntary.
B．They used to use display type.
C．They were all of the same size.
D．They were more formal.