课后限时自测(十四)Ⅰ.语法填空

　　In ancient times，many people believed the earth was a flat disc.Well over 2，000 years ago，the ancient Greek philosophers were able to put forward two good arguments__1__(prove)that it was not.Direct observations of heavenly bodies were the basis of both these__2__(argue)．

　　First，the Greeks knew that during eclipses (月食)of the moon the earth was__3__the sun and the moon，and they__4__(see) that during these eclipses，the earth's shadow on the moon was always round，they realized that this could be true only__5__the earth was spherical( 球形的)．If the earth was a flat disc，then__6__shadow during eclipses would not be a prefect circle; it would be stretched out__7__a long ellipse (椭圆)．

　　The second argument was based on__8__the Greeks saw during their travels.They noticed that the North Star appeared lower in__9__sky when they traveled south，in the more northerly regions，the North Star appeared to be much__10__(high)in the sky.

　　【语篇解读】　本文主要讲述了古希腊哲学家很早就认识到地球是球形而不是平的。

　　1．proving　现在分词短语作定语。

　　2．arguments　名词作宾语，由these可知是复数。

　　3．between　根据后面的and可知。

　　4．saw　由上下文可知用一般过去时。

　　5．if　根据前后句的条件关系可知，if引导条件从句。

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