4.G　根据“But looking at the many cases of deliberate trickery in apes,it is impossible to explain them all as simple copying.”可知,空处是对猩猩偷袭敌人的动机的推测,G项符合语境。

　　5.E　根据空前一句及后文的“Studying the intelligence of our closest relative”可知,空处是说猩猩的欺骗能力是评价其智力高低的有效指标,E项符合语境。

　　三、短文改错(满分10分)

　　Last summer I learnt to ride a bicycle.At first,I was unable to control its directions.Sometimes I fall to the right or to the left.I was worrying to ask my father impatiently how I could ride straight,so he didn’t answer me directly.Instead,he took me to side of the street.“Can you find any bike track what is really straight?” asked my father.I watched more carefully and shook my head.

　　“No,” he said,“in fact,neither of the tracks is always straight.But just by correct the direction every now and then,I have already gone forward.”

　　(2015·西安八校联考)

　　1.第2句:directions→direction。根据前文的“a bicycle”可知此处应用单数形式,故将directions改成direction。

　　2.第3句:fall→fell。根据语境可知应用一般过去时,故将fall改为fell。

　　3.第5句:worrying→worried。本句主语为I,人应是感到焦虑的,故将worrying改为worried。

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