【单选题】The predictability of our mortality rates is something that has long puzzled social scientists. After all, there is no natural reason why 2,500 people should accidentally shoot themselves each year or...
A.
The mortality rate can not be predicted.
B.
The death toll remained stable year after year.
C.
A quota for each type of death has not come into being.
D.
People lost their lives every year for this or that reason.
【单选题】Lately social scientists have begun to ask if culture is found just in humans, or if some animals have culture too. When we speak of culture, we mean a way of life a group of people have in common Cul...
A.
the history of animal learning
B.
the difference between animals' culture and that of human beings
C.
the various aspects of animals culture
D.
the dividing line between animals and human beings