Our ancestors celebrated          birth of           child by giving away red eggs.

       A. the ; a       B. the ; the     C. 不填; a     D. 不填； the

A


解析:

birth 前用the 表示特指“嬰兒的誕生”.child前用a表示類別，泛指.故選A.

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B．direct contact with a variety of plants has decreased
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D．research is unable to keep up with the increasing number of plants
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A．the changing diets of early humans
B．the development of a system of names for plants
C．the invention of agricultural implements （工具） and machinery
D．the discovery of certain grasses that could be harvested and replanted
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B．the discovery of certain grasses
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