单项选择题

According to the passage, the critical period for learning a language is ______.

A．at the age of ten months
B．between the ages of about ten months and ten years
C．at the age of ten years
D．from some time after birth to six or seven years
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单项选择题
In the last paragraph, Frank lists all of the following as the factors contributing to the difficulty of recruitment ______.
A．some companies do not have a clear target when they are doing the marketing
B．some students make hasty decisions about their jobs
C．many students do not have the required research skills
D．many students have little knowledge about the companies they apply for
单项选择题
According to the study by Thorpe, a chaffinch reared in isolation after its birth ______.
A．never sings
B．cannot learn songs from other species of birds
C．never sings as well as other chaffinches
D．sings the same song all the time
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