第6部分：完形填空(第51——65題，每題1分，共15分)

下面的短文有15處空白，請根據(jù)短文內(nèi)容為每處空白確定1個最佳選項。

51.

A. Consider

B. Considering

C. Considered

D. Having considered

52.

A. totals

B. money

C. sums

D. dollars

53.

A. to

B. for

C. by

D. /

54.

A. various

B. variable

C. varied

D. variant

55.

A. from

B. in

C. out of

D. by

56.

A. has learned

B. has been learned

C. is learned

D. can learn

57.

A. is

B. are

C. has

D. was

58.

A. effective

B. efficient

C. more effective

D. effect

59.

A. economic

B. economical

C. economies

D. economy

60.

A. improve

B. improving

C. improved

D. being improved

61.

A. as

B. unless

C. although

D. though

62.

A. that

B. it

C. which

D. /

63.

A. observe

B. observes

C. observing

D. to observe

64.

A. Increasing

B. Increased

C. Increasingly

D. To increase

65.

A. which

B. for which

C. among which

D. of which

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