What do we know about mother-reared rhesus monkeys? A．They only stay with their peers until the age of six months. B．They are not easily frightened by strange people and events. C．Their brain and body chemistry may be remarkably changed. D．They abuse or ignore their offspring when becoming mothers.
A.They B. B．They C. C．Their D. D．They E.
【参考答案】
B 细节题。对于两种不同环境(母亲亲自养育和没有母亲养育)下长大的恒河猴的对比，主要在第三、四两段中有所论述。根......