求助og一道阅读题，practice two 里面的

Muse7UID: 3561282

Historians credit repeated locust invasions in the nineteenth century with reshaping
United States agriculture west of the Mississippi River. Admonished by government
entomologists, farmers began to diversify. Wheat had come to nearly monopolize the
region, but it was particularly vulnerable to the locusts. In 1873, just before the locusts’
most withering offensive, nearly two-thirds of Minnesota farmland was producing
wheat; by the invasions’ last year, that fraction had dropped to less than one-sixth.
Farmers learned that peas and beans were far less vulnerable to the insects, and corn
was a more robust grain than wheat. In addition to planting alternative crops, many
farmers turned to dairy and beef production. Although pastures were often damaged
by the locusts, these lands were almost always left in better shape than the crops were.

According to the passage, before the recommendations by the government
entomologists, which of the following was true about farming west of the
Mississippi River?
A Farmers focused primarily on growing wheat.
B Peas and beans had not yet been planted in the region.
C A relatively small portion of farmland was devoted to crops other than wheat.

答案显示选AC，根据og选C的原因是，Choice C is correct: given that wheat was the dominant crop, only a relatively small portion of farmland could have been devoted to other crops.
但我觉得C不对啊，很可能之前根本就没种过CROPS啊，文中只说了很大一部分种的是wheat，没提到CROPS的情况，而从C选项来看，虽然说 了很小一部分，但这选项还是觉得那还是种了啊

Muse7UID: 3561282

来人呐呐呐呐~~~