2017托福100篇阅读理解试题（十四）_第2页

　　6. Combines and self-binding reapers were similar because each

　　(A) could perform more than one function

　　(B) required relatively little power to operate

　　(C) was utilized mainly in California

　　(D) required two people to operate

　　7. The word "they" in line 19 refers to

　　(A) grain stalks

　　(B) threshing machines

　　(C) steam engines

　　(D) horses

　　8. It can be inferred from the passage that most farmers did not own threshing machines because

　　(A) farmers did not know how to use the new machines

　　(B) farmers had no space to keep the machines

　　(C) thresher owner had chance to buy the machines before farmers did

　　(D) the machines were too expensive for every farmer to own

　　9. The word "ponderous" in line 21 is closest in meaning to

　　(A) advanced

　　(B) heavy

　　(C) complex

　　(D) rapid

　　参考答案：ACBDC ABDB