課后練習：

1 The vast expanse of the UnitedStates of America stretchesfromthe heavily industrialized,metropolitan Atlantic seaboard ____ the rich flat farms of the central plains,___ the Rocky Mountains to the fertile west coast, then halfway ___ the Pacificto the balmy island-state of Hawaii.

A through, over, across B across, over, across

C over, through, above D across, above, across

2 The American scene _____ theviewer with both its variety and size.

A owes B owns C awes D saw

3 It is more than _______ thesize of Sichuan province.

A two and a half times B a half two times

C two and half times D a two and half times

4 The sparsely _____,far-northern state of Alaska is the largest state.

A settle Bsettled C settling D being settled

5 The broad Mississippi River system,famedin song and legend, _____ 6400 kilometers.

Ameans B meaning C meanders D had meandered

6 Underground, ____ mineralsprovides a solid base for American industry.

A a wealth of B a wealthy of C wealth of D worthy of

7 Texas alone _____ one-fifth thevalue of all U.S. mineral production.

A according to B accounts for

C accuse of D is accustomed to

8 American has long been known asa “____ pot”, for it is a nation of immigrants from all over the world.

A melting B melted C melt D molten

9 Today they live on land _____for them in 31 states.

Asetting aside B set aside C setoff D set out

10 The next largest group ofAmericans _____their ancestry ____ Africa.

Atrace, in B go back, to C trace, to D date back, to

11 Many live in Hawaii, more thantwo-thirdsof ____ people boast on Asian or Polynesian heritage.

A which B whose C who D whom

12 Americans are always _____ themove.

Ato B in C on D being

13 _____ by French architectPierre in the late 18^thcentury, it was the world’s first cityespeciallyplannedas a center of government.

A Lay out B Laying out C Lying out D Laid out

答案：1B 2C 3A 4B 5C 6Ａ 7B 8Ａ 9B　10Ｃ 11B 12C 13D