英语六级

单选题

A．The extent of damage to the nervous system.
B．The presence or absence of certain nerve-cell receptors.
C．The size of nerve-cell receptors in the brain.
D．The level of danger in the mammal's environment.

参考答案：B进入在线模考
According to the professor, what contribute to a mammal tendency to be fearful?
细节题。根据And the degree of overall fearfulness in the mammal seem to depend in the large part on the presence or absence of these nerve cell receptors．可知，正确答案为B。

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