C.The farmers couldn't leave without footprints.
D.The farmers couldn't keep the wheat straight up.
解析:事实细节题。根据第三段的内容可知,人们试图人为地制造一些类似的“怪圈”,可是他们的尝试以失败而告终,因为只要他们进入麦田,就必然会留下踪迹。
答案:C
4.One explanation given by scientists for the crop circles is that they are made by .
A.airplane crashes
B.air movement
C.unknown flying objects
D.new farming techniques
解析:事实细节题。由文章最后一段的内容可知B项符合题意。
答案:B
B
How to Be a Winner
Sir Steven Redgrave
Winner of 5 Olympic Gold Medals
“In 1997 I was found to have developed diabetes (糖尿病).Believing my career (职业生涯) was over,I felt extremely low.Then one of the specialists said there was no reason why I should stop training and competing.That was it —the encouragement I needed.I could still be a winner if I believed in myself.I am not saying that it isn't difficult sometimes.But I wanted to prove to myself that I wasn't finished yet.Nothing is to stand in my way.”
Karen Pickering
Swimming World Champion
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