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Most of animals communicate with one another to a greater or lesser de- (1)______ gree, and the more social a species, the more
Most of animals communicate with one another to a greater or lesser de- (1)______ gree, and the more social a species, the more
admin
2013-10-08
53
问题
Most of animals communicate with one another to a greater or lesser de- (1)______
gree, and the more social a species, the more communicative it intends to be. (2)______
Communication comes in many forms—it may be acoustic, visual, chemical
or tactile and, depending upon the message and the medium, different types
of communication may be more or less effective and/ or efficient. A species
may excel at one type of communication and therefore be almost "blind" in (3)___ ___
another. For example, humans use a very advanced form of acoustic com
munication, language, and yet our olfactory communication is extremely
poor compared to most other mammals.
While there aren’t any species that can compete for human language in (4)______
terms of their richness and complexity, some species have relatively large (5)______
vocal repertoires and extended communication networks. Elephants are one (6)______
such species. Elephants also communicate with one another using intricate
chemical and tactile signals and visual displays. If we have to rank these (7)______
different systems in order of importance to elephants we would put acous
tic and chemical communication together as most important, followed by
visual and tactile communication. But we are not elephants! So, why have
elephants evolved such large vocal repertoire and such an extensive commu- (8)______
nication network? One answer is that elephants have a very complex social
system and, therefore, they have needed to develop a complex suite of vo
calizations to interact in an appropriate way to the many different individu- (9)______
als they meet on a daily basis and to mediate many complex relationships (10)______
that they maintain.
(7)
选项
答案
have — had
解析
条件从句中的确未必要用动词的虚拟语气,陈述语气在很多情况下完全可以。所以,孤立地看这个条件从句,并没有任何问题,但是我们必须注意条件从句和主句在语气上的一致性问题。这句话的主句用的是虚拟语气,所以从句也应当改成同样的语气。
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0
专业英语八级
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