此题要求改正所给短文中的错误，对标有题号的每一行作出判断；若无错误，在该行右边横线上画一个勾(√)；若有错误(每行只有一个错误)，则按下列情况改正；
该行多一个词：把多余的词用斜线(＼)划掉，在该行右边横线上写出该词，并也用斜线划掉。
该行缺一个词；把缺词处加一个漏字符号(∧)，在该行右边横线上写出该加的词。
该行错一个词：把错的词下划一横线，在该行右边横线上写出改正后的词。
注意：原行没有错的不要改。
I visit the zoo yesterday, but I was very unhappy and 76.______
angry with the things that I saw. The large animals were 77.______
in small cages. The lion was walking back and forth. It was 78.______
completely bored. The tiger was asleep all afternoon. I saw 79______
people feeding to the fish, they were throwing rice and meat 80.______
into the pond, that could kill the fish, but no one tried to 81.______
stop them. When I had drink at the zoo restaurant, the waiter 82.______
served me rude. Outside the restaurant, the rubbish bins were 83.______
full and rubbish was blowing everywhere. It seems that the 84.______
zoo is not look after the animals or the visitors very well. 85.______
。关于
的说法不正确的是 [ ]
互为同位素 
少一个电子