A．Different uses of com．
B．The history of the development of com．
C．The popularity of corn．
D．Increasing the production of corn．
参考答案C
解析:
(23) In the late 1400s, when Christopher Columbus returned to Spain from the western part of the earth,he brought with him a sample of corn.Corn is a popular and nutritious type of food we have today in our dailydiet.
(24) The corn that Columbus introduced to Europe was originally native to Mexico.The people of the Americans probably started to plant this grass as early as 5000 B.C.
After about a thousand years, they had developed highly productive types of corn which later became the basis for the great pre-Columbian civilizations.Actually, many countries regarded corn as one of their basic crops.
To certain degree, we can say that many ancient cities were built on corn.Corn is one of the major foodsboth for men and some domesticated animals, such as chicks and pigs.The corn and the people Whocultivated it developed together.Without humans to care for it, corn could not survive.
(25) There were times when some natural disasters stroke corn planting.The people Who planted cornmade great effort to protect it from being destroyed.They tried to gather the seeds to enlarge the plantingareas.
The planting people tried various ways to enhance the production of corn.They tried to get rid of the weed sand fertilized corn at proper times.They also had to make sure corn is watered when there's a lack of rain.
What is the main topic of this talk?
C.【精解】文中提到，克里斯多弗·哥伦布回国时带回了玉米的样本，然后指出，玉米是如今日常饮食中一种流行和营养丰富的食物。由此可知，文章主要讲述了玉米的流行。故答案为C.
(24) The corn that Columbus introduced to Europe was originally native to Mexico.The people of the Americans probably started to plant this grass as early as 5000 B.C.
After about a thousand years, they had developed highly productive types of corn which later became the basis for the great pre-Columbian civilizations.Actually, many countries regarded corn as one of their basic crops.
To certain degree, we can say that many ancient cities were built on corn.Corn is one of the major foodsboth for men and some domesticated animals, such as chicks and pigs.The corn and the people Whocultivated it developed together.Without humans to care for it, corn could not survive.
(25) There were times when some natural disasters stroke corn planting.The people Who planted cornmade great effort to protect it from being destroyed.They tried to gather the seeds to enlarge the plantingareas.
The planting people tried various ways to enhance the production of corn.They tried to get rid of the weed sand fertilized corn at proper times.They also had to make sure corn is watered when there's a lack of rain.
What is the main topic of this talk?
C.【精解】文中提到，克里斯多弗·哥伦布回国时带回了玉米的样本，然后指出，玉米是如今日常饮食中一种流行和营养丰富的食物。由此可知，文章主要讲述了玉米的流行。故答案为C.
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A．It must be watered by people．
B．It has to be protected from stealing．
C．It has to be protected from natural disasters．
D．It will be eaten out by other animals．
