单项选择题

The author cites the case of illegitimate children to show that ______.

A．children should also be taken good care of at their early age
B．the development of brain stops at a rather early age
C．early age is crucial to development in other aspects than language
D．intelligence is affected by the capacity of language learning

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单项选择题

The police excluded the possibility of revenge by eBay customers after ______.

A．the bodies were found
B．the gun was discovered
C．the gun was analyzed
D．Neil was found in London

单项选择题

What can we learn from the first paragraph about the critical period

A．It is a point at which the process of learning ends.
B．It is a phase which is crucial to the acquisition of a certain ability.
C．It is a phase after which we do not need to acquire a certain ability.
D．Mans and animals have a similar critical period for a certain ability.