2. 外语
  3. 　　 Before the 1500’s, the western plains of North America were dominated by farmers. One group, the Mandans,【C1】______ in the

　　 Before the 1500’s, the western plains of North America were dominated by farmers. One group, the Mandans,【C1】______ in the

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问题 　　  Before the 1500’s, the western plains of North America were dominated by farmers.  One group, the Mandans,【C1】______ in the upper Missouri River country, primarily in present-day North Dakota. They had large villages of houses【C2】______  close together.
　 　The【C3】______  arrangement enabled the Mandans【C4】______  the attacks of others who might seek to【C5】______  some of the food these highly capable  farmers stored from one year to the next.
　　 The women had primary responsibility for the fields.They had to exercise【C6】 ______ skill to produce the  desired results,【C7】______  their northern location meant fleeting growing seasons. Winter often lingered;  autumn could 【C8】______  by severe frost.  For good  measure, during the spring and summer, drought, heat, hail, grasshoppers, and other【C9】______  might await the wary grower.
　 　Under【C10】______ conditions, Mandan women had to grow maize capable of weathering【C11】______ They began【C12】______ it appeared feasible to do so in  the spring.
　 　Harvesting proceeded in【C13】______ stages. In August the Mandans picked a small amount of the crop【C14】______ it had matured fully. This green corn was  boiled, dried, and shelled, with some of the maize【C15】______ for immediate consumption and the reststored in【C16】______ bags. Later in the fall, the people picked the rest of the corn. They saved the best of the harvest for seeds or for trade,【C17】______ the remainder eaten right away or stored for later use in underground reserves.  With appropriate【C18】______ of the extra food, the Mandans protected themselves【C19】______ the disaster of crop failure and accompanying【C20】______ .
【C12】
选项 A、so early as
B、earlier than
C、early when
D、as early as
答案D
解析
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