4. A. hardly B. difficultly

C. clearly D. easily

答案:D

解析:由于语言发生了很大变化, 人们可以很"容易地"通过说话方式把英国人和美国人区分开。

5. A. with B. from

C. to D. and

答案:B

解析:由本句前面的tell可知此处用from, tell. . . from. . . 意为"把......和......区分开"。

6. A. disappeared B. appeared

C. spoke D. took

答案:A

解析:由"but were kept in America"可知本题应该用disappeared与were kept相对应。

7. A. not B. hardly

C. too D. still

答案:D

解析:此句是对"but were kept in America"的进一步说明。

8. A. America B. France

C. England D. Germany

答案:C

解析:由but前的"in different parts of America"可知此处应该选择England。

9. A. word B. forms

C. ones D. ways

答案:C

解析:由前面的"new words"可知此处应该用old words。用ones代替words。

10. A. another B. also planted

C. a plant D. a kind of food

答案:A

解析:由上文的"one kind of plant"可知, 此处应指另外一种植物, 即用another。

11. A. added B. has added

C. discovered D. has discovered

答案:B

解析:在近三个世纪以来, 要想表达以前不知道的事物, 就必须增加词汇, 因此应用has added。

12. A. anywhere B. in some countries

C. before D. for centuries

答案:C