[单项选择]In the animal world, chimpanzees were believed ______.
A. to be collaborative and altruistic
B. to act independently and individually
C. to understand cooperation just as man does
D. to know how to achieve success with coordinated action

[单项选择]In the animal world, chimpanzees were believed ______.


A. to be collaborative and altruistic
B. to act independently and individually
C. to understand cooperation just as man does
D. to know how to achieve success with coordinated action

[单项选择]The ancient Egyptians believed all illnesses were related to __ was eaten.
A. which
B. it
C. what
D. that

[单项选择]If animal parents were judged by human standards, the cuckoo would be one of nature's more ______ creatures, blithely laying its eggs in the nests of other birds, and leaving the incubating and nurturing to them.
A. mettlesome
B. industrious
C. domestic
D. irresponsible

[单项选择]

A major reason for (21) in the animal world is territory. The male animal establishes an area. The size of the area is sufficient to provide food for him, his (22) and their offspring. Migrating birds, for example, (23) up the best territory in the order of "first come, first (24) . "The late arrivals may acquire larger territories, but less food is (25) , or they are too close to the (26) of the enemies of the species. (27) there is really insufficient food or the danger is very great, the animal will not mate. In this way, the members of the species which are less fit will not have (28) .
When there is conflict (29) territory, animals will commonly use force, or (30) of force, to decide who will stay and who will go. It is interesting to note, however, that animals seem to use the (31) amount of force necessary to drive away the (32) There is usually no killing. In the case of
A. by
B. for
C. about
D. lined