急求这几题英语的讲析,高手们快来帮我!o(∩∩)o...1.Theworldhadonlythousandpeopie.A.fewB.afewC.twoD.many2.Theriverisverydirty.peopiegotoswiminit.A.Fewb.AfewC.LittleD.Alittle3.MayIputmybikehere

Question

急求这几题英语的讲析,高手们快来帮我!o(∩_∩)o...
1.The world had only_______thousand peopie.
A.few B.a few C.two D.many
2.The river is very dirty._______peopie go to swim in it.
A.Few b.A few C.Little D.A little
3.May I put my bike here?
No,you_______.You should put it over there.
A.couldn't B.needn't C.mustn't D.won't
4.Our teachers are at work.You_______make so much noise.
A.won't B.mustn't C.don't have to D.needn't
B A C B
给我讲解一下为什么,1,2中的选项各是什么意思,修饰什么,是肯或否.
还有mustn't是什么意思.

Answer 1

only只能加a little或者a few
a little表示不可数名词,a few表示可数名词
看这样的搭配只能选B
河很脏,按逻辑推理,应该是很少有人会去脏的河里游泳
所以填的词,意思应该是“很少”
所以就有few和little的选择
people是可数名词,所以选A
口气是委婉地请求,但是回答是不允许
是主观上的,所以用强硬的语气
所以选C
跟上道一样
老师在工作,不能打扰到他
所以是强硬的语气,mustn‘t
所以选B