The word patches in paragraph 5 is closest in meaning to
A. dark places
B. family groups
C. warm spots
D. small areas
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According to the passage, at what point did writing begin to have a major effect on communication？
A. When alphabets were developed
B. When books became available
C. When education was formalized
D. When the telegraph was invented
Which of the following is an indirect indicator of a population's density？
A. The distribution of food in a given area
B. The number of nests in a given area
C. The number of births in a given period of time
D. The number of individuals counted in a given area
The word thwarted in paragraph 4 is closest in meaning to
A. preceded
B. ended
C. concealed
D. inspired
What can be inferred about children who easily solve the water task described in paragraph
A. They have already experienced the five-seven shift．
B. They were taught about the concept of conservation．
C. They had time to practice the task before the experiment．
D. They are more intelligent than others of the same age．
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