2. B。只有真正理解短文所述的内容之后，才能判断出短语“Flattened wheat”的确切意思。实际上，文中第三自然段中“The wheat in the circles lies on the ground but is never broken; it keeps on growing, and the farmers can later harvest it.”一句已对此短语的意思有所暗示。由这几句话，可知小麦既不是折断了的，也不是在生长的，更不是已收获的小麦。

1. A。解答此题，必须依次弄清田地里留下的圆圈的形状。1978年发现的是中间有一个直径约为6米的大圆，周围分布着4个小些的圆。即如图B中的样子。三年后另一农民发现的几个直径约为15米的大圆，他们几乎差不多大，即如图D所示的那样。就在同一年，又有一个农民发现三个圆，一个大些，另两个小，大圆在小圆的中间，如图C所示。而科学家身后的圆圈与别的都不同，由此可以找到答案A。

2. “Flattened wheat” means ___________.

　A. broken wheat B. lying wheat

　C. harvested wheat D. growing wheat

1. Which picture is probably the one formed in the field behind the scientists?

20. (1) He cut off the head of each sheep with a sharp knife.

　　　　　 (2) The sheep would have a baby sheep and had been sent to the vet.

19. (1) F　 (2) F　

18. 他们就那样开始工作(偷羊)了,而且进展得很顺利。

17. locked; counting　

20. 根据短文内容回答下列问题。

(1) How did the thief outside prevent the sheep from running away?

　 ___________________________________________________

(2) What happened to the sheep that the thief inside couldn’t find?　

　 __________________________________________________

Key: A) 1-5 BCABD　

　　 B) 6-10 ADBDA　

　　 C) 11-15 CDCDB

　　 D)16. (1)twenty-eighth → twenty-eight　　 (2)something → anything