单项选择题

Behaviorists believe that______.

A．humans should behave mechanically
B．human behavior patterns are based on biological and genetic factors
C．human behavior is determined mainly by their surroundings
D．factors in the environment have little influence on people's personalities.

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单项选择题

The reason some children are backward in speaking is most probably that______.

A．they are incapable of learning language rapidly
B．they are exposed to too much language at once
C．their mothers respond inadequately to their attempts to speak
D．their mothers are not intelligent enough to help them

单项选择题

Which of the following can NOT be inferred from the passage

A．The faculty of speech is inborn in man.
B．Encouragement is anything but essential to a child in language learning.
C．The child's brain is highly selective.
D．Most children learn their language in definite stages.