A.otherwise
B.whereas
C.unless
D.nevertheless
解析 句意:人类的行为大多是学习的产物,而动物的行为则主要依靠本能。whereas 意为“然而,却”,引导对立的从句;otherwise意为“否则”;unless意为“除非”;nevertheless 意为“然而”,不引导从句。
答案 B
15.Before you decide to leave your job,________the effect it will have on your family.
A.consider
B.considering
C.to consider D.considered
解析 before 引导的是时间状语从句, 填空句为主句, 而此主句为祈使句, 故动词用原形。其中 it will have...为修饰名词 the effect 的宾语从句。
答案 A
Ⅳ.阅读理解
A
If you're out for a walk and a bird in a tree says to you “Hello
there”, don't worry, you're not going mad.
Naturalists have reported a growing phenomenon of pet parrots
that have been taught to repeat phrases by their owners before
escaping from their cages and then passing on the technique to the
wild flocks they join. “Hello there!”, “Hello darling!”and “What's happening?”are among the chorus of comments that flocks of wild birds have been repeating after picking up words and sentences from other birds that were once
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