2. 外语
  3. Most of animals communicate with one another to a greater or lesser de- 【M1】______ gree, and the more social a species, the more

Most of animals communicate with one another to a greater or lesser de- 【M1】______ gree, and the more social a species, the more

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问题     Most of animals communicate with one another to a greater or lesser de- 【M1】______
gree, and the more social a species, the more communicative it intends to be. 【M2】______
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 【M3】______
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 【M4】______
terms of their richness and complexity, some species have relatively large 【M5】______
vocal repertoires and extended communication networks. Elephants are one 【M6】______
such species. Elephants also communicate with one another using intricate
chemical and tactile signals and visual displays. If we have to rank these 【M7】______
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- 【M8】______
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- 【M9】______
als they meet on a daily basis and to mediate many complex relationships 【M10】______
that they maintain.
【M5】
选项
答案their — its
解析 这一题考查的是代词的所指问题。碰到代词的问题时，首先要确定代词的先行词，然后要判断代词和先行词在数、性、人称方面是否保持了一致。那么这里的their为什么要改成its呢?因为它的先行词并不是species而是human language，所以应该是单数形式。
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