— Look, there is a lot of litter in the river.— Yes, it's said that 80 per cent of fish in this rive

题干

— Look, there is a lot of litter in the river.

— Yes, it's said that 80 per cent of fish in this river ________ live long.

A：doesn't

B：don't

C：isn't

D：aren't

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下面是我国古代某地区居民的职业结构表，它反映了一种新的生产关系产生。据推断这里的某时期某地可能是（）

职业	自耕农地主	佃农	工场工人	商人工场主
占人口比	24%	36%	30%	10%