III. Cloze test 完形填空 1’ * 20 = 20’
阅读下面短文，掌握其大意，然后从26－45各题所给的四个选项（A、B、C和D）中选出能填入相应空白处的最佳选项。
People from Great Britain brought the English language to North America in the 16th and 17th centuries. And in the 36 300 years, there were 37 many changes in 38 places that now people can 39 tell an English person 40 an American in the way he or she talks.
Many old words 41 in England but were kept in America. For example, 300 years ago people in Great Britain got their water from something they called either a
“faucet”, a “spigot”, or a “tap”. All these words are 42 heard in different parts of America, but only “tap” is still common in 43 . Americans often made up new words or changed old 44 . “Corn” is one kind of plant in America and 45 in England.
Also, over the last three centuries the English language 46 thousands of new words for things that weren’t known 47 . And often, American and English people used two 48 names for them. A tin can (洋铁罐头) is called “tin” for short in England, but a “can” in America. The word “radio” is 49 all over the world, including America. But many English people call it a “wireless”. And almost anything having something to do 50 cars, railroads, etc. 51 different names in British and American English．
But now American and British English may be growing closer together. One 52 is the large amount (数量) of American speech that British people hear daily in movies, on television, or 53 travelers. 54 this, Americans seem to be influencing (影响) the British more and more. So some day, English may even be 55 on both sides of the Atlantic (大西洋).
36．A. following B. recent C. oldest D. last
37．A. such B. too C. so D. great
38．A. either B. both C. neither D. two
39．A. hardly B. difficulty C. clearly D. easily
40．A. with B. from C. to D. and
41．A. disappeared B. were disappeared C. spoke D. were spoken
42．A. not B. hardly C. yet D. still
43．A. America B. the two countries C. England D. British
44．A. word B. forms C. ones D. ways
45．A. another B. also planted C. a plant D. a kind of food
46．A. added B. has added C. discovered D. has discovered
47．A. anywhere B. in some countries C. before D. for centuries
48．A. new B. short C. different D. surprising
49．A. produced B. made C. developed D. used
50．A. to B. away C. with D. from
51．A. has B. have C. has given D. was given
52．A. thing B. cause C. reason D. expression
53．A. from B. through C. on D. by
54．A. For B. Because C. Besides D. Because of
55．A. different B. more different C. the same D. more useful
均为可微函数，且
，已知(x0，y0)是f(x,y)在约束条件
下的一个极值点，下列选项正确的是