（    ）45．A．exercises                        B．grade                      C．practice

（A）

    Scientists think that a weather pattern（形式）called E1 Nin6（厄尔尼诺现象）caused the

drought（干旱）in Australia．E1 Nin6 causes different weather in different parts of the world．It

causes a lot of rain and floods in some places．It causes droughts in other places．Droughts can badly affect people and the land．E1 Nin6 lasts about a year．

  In normal weather conditions．warm winds from South America blow from east to west across

the Pacific Ocean．The winds early storms to Australia．These storms bring rain to Australia．

    During an E1 Nin6 weather pattern．the winds change direction．They blow from west to east

across the Pacific Ocean．The storms no longer move across Australia．So Australia gets very little  rain during E1 Nino．

（    ）44．A．As                                B．For                        C．On

（    ）43．A．everything                            B．thing                      C．nothing’

（    ）42．A．thank                                   B．refuse                     C．dislike

（    ）41．A．how                              B．what                       C．whose

（    ）40．A．used                 B．sad              C．able