2. 外语
  3. The availability of food and probably, to lesser extent, the degree of 【M1】______ danger from predators are two basic influences

The availability of food and probably, to lesser extent, the degree of 【M1】______ danger from predators are two basic influences

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问题    The availability of food and probably, to lesser extent, the degree of 【M1】______
danger from predators are two basic influences in the relations between【M2】______
individuals within species; and here the rules that operate for primates【M3】______
also hold for all other species too. The higher primates are special because .【M4】______
they have a propensity to be social rather than solitary. Differences in
environmental conditions therefore tend to determine the way in which
they are social rather than whether they are social. The reason the higher
primates tend to be social animals is that group life offers the opportunity【M5】______
for prolonged learning during childhood and learning is a pastime to which【M6】______
primates engage far more .than any animal. Learning is a pastime with a【M7】______
purpose, however, namely to equip individuals with more effective
knowledge of the environment in which it must survive. Greater  【M8】______
knowledge implies a greater chance of survival, which is that evolution is【M9】______
all about.
A period of childhood education implies dependency on an adult, and
this turns out to meaning that, without exception, the basis of all primate【M10】______
social groups is the bond between mother and infant.
【M1】
选项
答案to∧lesser extent—加入a
解析 to a extent意思是“在一定程度上”。
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