你好.
我认为, I've got a little ____(fish) in my house.这个句子应该这样断句（请注意空格）：
I've got a little fish in my house.（我家有条小鱼./ 我养了条小鱼.）a little fish 是“一条小鱼”；
而不是这样断句：
I've got a little fish in my house.（我家有点鱼肉.）此其一.
另外,从A.juice B.mice C.bread D.fish 四个答案来看,再考虑到后面一句“Why not keep two or more?”,先要排除不可数的A.juice、 C.bread； 答案B的mice 是mouse（老鼠）的复数形式,肯定也不可以；而答案D的fish作为“鱼肉”是不可数的,作为“鱼”是可数的,这样,再联系到后面一句“ Why not keep two or more?”（干嘛不养两条,或是多养几条呢?）,就可以得出这里用的“fish”应该是可数的“鱼”的意思,不是“鱼肉”.
再者,fish作为可数名词,在不特指“鱼的种类”时,也不用复数：
These fish are often eaten raw. 这些鱼常常生吃.
They caught several fish. 他们捉到了几条鱼.
A whale is a fish. True or false? 鲸鱼是鱼,对还是错?
Thousands of small fish are thrown back into the sea as bycatch. 成千上万误捕的小鱼扔回大海中去了.
Fish are abundant in the lake. 湖里鱼很多.
I was chatting to an islander who had just caught a fish... 我正在跟一个刚刚抓到一条鱼的岛民聊天.
The fish were counted and an average weight recorded. 数了数鱼的数量,并把平均重量记录了下来.
There are plenty more fish in the sea.海里的鱼有的是.天涯何处无芳草.
如果能帮到你就请采纳.如有疑问,请继续提问.
祝你进步!