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Reading comprehension -TOEFL- Lesson 91 (Đọc hiểu -TOEFL- Lesson 91)

Reading and answers the question:

   The availability of food and probably, to a lesser extent, the degree
of danger from predators are tow basic influences in the relations
between individuals within a species; and here the rules that operate
for primates also hold for all other species. The higher primates
5 are special because, by their nature, 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 living offers the opportunity
10 for prolonged learning during childhood; and learning is a pastime
in which primates engage far more than any other animal. Learning
is a pastime with a purpose, however, namely to equip individuals
in a group with a amore effective knowledge of the environment in
which they must survive. Greater knowledge implies a greater chance
15 of survival-which is what evolution is all about.

A period of childhood education implies dependency on an adult, and
this turns out to mean that, without exception, the basis of all
primate social group is the bond between mother and infant. That
20 bond constitutes the social unit out of which all higher orders of
society are constructed.
1. What is the main subject of the passage?

2. The phrase beginning with "namely" near the end of the first paragraph is used to

3. According to the passage, the primary goal of learning among the higher primates is

4. The author implies that the most fundamental social unit in human society is the

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