9．A.roads B．houses

　　C．people D．bushes

　　10．A.help B．hold

　　C．cause D．save

　　11．A.if B．since

　　C．but D．so

　　12．A.move B．fight

　　C．establish D．protect

　　13．A.fire B．valley

　　C．people D．stream

　　14．A.right B．left

　　C．middle D．top

　　15．A.crash B．shake

　　C．burn D．sink

　　16．A.first B．lucky

　　C．poor D．only

　　17．A.dried up B．eaten up

　　C．burnt up D．risen up

　　18．A.fighting B．suffering

　　C．preventing D．stopping

　　19．A.what B．which

　　C．as D．that

　　20．A.terrible B．dangerous

　　C．valuable D．strange

　　Ⅴ.阅读理解

　　American cities are similar to other cities around the world. In every country, cities reflect the values of the culture. American cities are changing, just as American society is changing.

After World WarⅡ， the population of most large American cities decreased; however, the population in many Sun Belt cities increased. Los Angeles and Houston are cities where population shifts (转移) to and from the city reflect the changing values of American society. In the late 1940s and early 1950s, city residents (居民) became wealthier. They had more children so