At first，people thought that the circles were a hoax.Probably young people were making them as a joke，or farmers were making them to attract tourists.To prove that the circles were a hoax，people tried to make circles exactly like the ones that farmers had found.They couldn’t do it.They couldn’t enter a field of grain without leaving tracks，and they couldn’t flatten the grain without breaking it.

　　Many people believe that beings from outer space are making the circles to communicate with us from far away and that the crop circles are messages from them.

　　Scientists who have studied the crop circles suggested several possibilities.Some scientists say that a downward rush of wind leads to the formation of the circles—the same downward rush of air that sometimes causes an airplane to crash.Other scientists say that forces within the earth cause the circles to appear.There is one problem with all these scientific explanations：crop circles often appear in formations，like the five-dot formation.It is hard to believe that any natural force could form those.

　　1．In the summer of 1978，an English farmer discovered in his field that ________.

　　A．some of his wheat had been damaged

　　B．some of his wheat had fallen onto the ground

　　C．his grain was growing up in circles

　　D．his grain was moved into several circles

【2017高考英语一轮复习（福建泉州专用）北师大版必修二《Unit4》强化演练知能闯关】相关文章：

★ 2017年高考英语二轮复习精品资料：专题16 书面表达（押题专练）（原卷版）

★ 【浙江专用】2014届高考英语一轮复习课时作业(二十三)必修5Unit 3《Life in the future》

★ （安徽专用）2014届高考英语一轮复习方案 作业手册（12）模块4 《Unit 12 Culture Shock》（含解析） 北师大版必修1

★ 2017届高考英语二轮复习课时训练：17（含解析）

★ 2014届高考英语一轮复习课时作业(十六)必修3Module 4《Sandstorms in Asia》（外研版）

★ （全国通用）2014届高考英语一轮单元复习 限时强化训练九

★ 2014届高考英语一轮复习课时作业(二十八)必修5Module 4《Carnival》（外研版）

★ 2017年高考英语二轮复习精品资料：专题15 完形填空（押题专练）（原卷版）

★ 四川省2016届高考英语一轮复习课时作业（20） Module 2 Traffic Jam 外研版必修4

★ 【浙江专用】2014届高考英语一轮复习课时作业(二十二)必修5Unit 2《The United Kingdom》