20. What does this passage tell us about?
21. How much energy does the sun give to the earth in a minute?
22. How do people use solar energy at present?
题解:
Passage 5
这是老师在课堂授课的讲稿。文章介绍了19世纪美国农民如何从自给自足到依赖他人的演变过程。分析了造成这一变化的原因。
听时要注意按照时间顺序理清农民的特点及原因。
16.D 这是一道主旨题。把握时间的顺序,如at the beginning of the 19th century, but by the mid century, by late in the century便可知。文章的最后一句话也说明了这层意思。
17.A 这是一道细节题。从revolutionary advances ... has vastly increased production of specialized crops .... 可知。
18.B 这是一道细节题。从Now farmers were no longer dependent ..., their lives were increasing controlled by banks, which had powder to grant or deny loans for new machinery.可知。
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