单选题
According to the passage, what was the first great step toward the practice of agriculture?
A、
The invention of agricultural implements and machinery .
B、
The development of a system of names for plants.
C、
The discovery of grasses that could be harvested and replanted.
D、
The changing diets of early humans.
【正确答案】
C
【答案解析】
[分析] 推断题。根据第二段第三句可知正确应该为C。A、B、D虽然与题干有关，但是不够全面、不确切。
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