阅读理解
(2018·重庆模拟)
The first potatoes were grown by the Incas of South America, more than 400 years ago. Their descendants(后代) in Ecuador and Chile continue to grow the vegetable as high as 14，000 feet up in the Andes Mountains. (That’s higher than any other food will grow.) Early Spanish and English explorers shipped potatoes to Europe, and they found their way to North America in the early 1600s.
People eat potatoes in many ways—baked, mashed, and roasted, to name just three. However, in the United States most potatoes are eaten in the form of French fries. One fastfood chain alone sells more than $1 billion worth of fries each year. No wonder, then, that the company pays particular attention to the way its fries are prepared.
Before any fry makes it to the people who eat at these popular restaurants，it must pass many separate tests. Fail any one of these tests and the potato is rejected. To start with, only Russet Burbank potatoes are used. These Idaho potatoes have less water content than other kinds, which can have as much as 80 percent water. Once cut
