第二节：短文改错(共10小题;每小题1分，满分10分)
此题要求改正短文中的错误。对标有题号的每一行作出判断：如无错误，在该行右边横线上划一个勾(√)；如有错误(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：在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：在错的词下划一横线，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。
Scientists around the world have been studying the warm      76.______
of waters in the Pacific Ocean being known as EL Nino. The       77.______                  
appearance of EL Nino is knowing to affect weather around        78.______           
world. Now scientists still do not completely understand           79.______           
them. Yet they find they can use it to tell the future in              80.______                      
different area in the world. The scientists write about              81.______
their recent work in the magazine Nature. Their computer          82.______                     
program can hardly tell when an EL Nino will appear. They         83.______
suggest that this could provide for an effective early warning        84.______
system and could prevent much of the disasters from happening.     85.______