五、学科融合·生物阅读理解
The Many Lives of Corn Food
People eat it in many ways: on the cob（玉米棒）or as snacks.
Animal feed
It's a top feed for farm animals, helping them grow strong.
Industrial use
It's used to make ethanol（乙醇）, a biofuel（生物燃料）, and other useful products.

（续表）
The Requirement of the Corn Plant

Corn is called the “Queen of Cereals（谷物）”! It's the world's third most important crop, right after rice and wheat.
()20. Which of the following is NOT a use of corn?
A. It can be eaten as snacks.
B. It can feed farm animals.
C. It can be made into ethanol.
D. It can be used to produce clothing materials.
()21. Which country produces the most corn in the world?
A. China.
B. The US.
C. Brazil.
D. Canada.
()22. What is the best temperature for corn to grow well?
A. 10℃—20℃.
B. 17℃—33℃.
C. 30℃—40℃.
D. 20℃—30℃.
()23. Which statement is TRUE according to the text?
A. Corn gained global importance in the 1930s.
B. Corn first grew in Europe from 9000 to 7000 BC.
C. GM corn has been planted since the 1980s.
D. Hybrid corn raised corn production in the early 1900s.

20~23: DBBD

【分析】
先逐题梳理解题思路：20题需从原文定位玉米的用途，排除原文提及的选项，选出未涉及的；21题考查世界玉米主产国，结合常识判断；22题考查玉米生长的适宜温度，对应正确范围；23题需判断陈述正误，结合农业相关知识筛选正确选项。
【解析】
20题：原文明确玉米可作零食（A项正确）、作为家畜饲料（B项正确）、用于制作乙醇（C项正确），未提及可制作服装材料，故选D。
21题：世界范围内美国是玉米产量最高的国家，故选B。
22题：玉米生长的最佳温度范围为17℃—33℃，故选B。
23题：杂交玉米在20世纪初推广后显著提高了玉米产量，A、B、C项陈述错误，故选D。
【答案】
DBBD
【知识点】
英语阅读理解、生物常识、农业知识
【点评】
本题为学科融合类阅读理解题，结合生物与农业知识，考查信息定位能力和基础常识积累，难度适中。
【难度系数】
0.5