请教如何区分和理解number 和 numbers

Maimai. · 发表于 2018-11-20 19:29:57

以下面两道题请教如何选择区分number 和 numbers .谢谢。
According to industry analysts, the recent growth in the number of hybrid motor vehicles in major metropolitan areas are likely to accelerate in the future.

the number of hybrid motor vehicles in major metropolitan areas are
the numbers of hybrid motor vehicles in major metropolitan areas are
the number of hybrid motor vehicles in major metropolitan areas is
the numbers of hybrid motor vehicles in major metropolitan areas is
hybrid motor vehicles’ numbers in major metropolitan areas are

答案： c

Although beavers can still be found throughout the western United States, their number has declined compared with the eighteenth century, when the abundance of beavers lured armies of European trappers into the Rocky Mountain region to slaughter them for their pelts.
- their number has declined compared with
- their numbers have compared with
- their numbers have declined since
- their numbers have in comparison to those of
- the number of them declined since
  
  答案：3 （（（请忽略这道题的时态问题，但从numbers 的方向帮忙区分）

请教如何区分和理解number 和 numbers

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