What does the writer want to tell us in the fourth paragraph？ A.The U．S．is richer than IndiA. B.Chickens were made to mature in shorter time and able to produce more eggs． C.There are 12 states in the Midwestern U．S． D.U．S．is able to increase food production with scientific techniques．
A.The B.S．is C. B.Chickens D. C.There E.S． D.U．S．is
【参考答案】
D 本题考查考生的理解判断能力，考的是对作者观点的理解。作者在第四段中以美国为例，告诉我们因为使用先进的技术，美......