2017年6月大学英语四级词句练习（17）

1.The board of the company has decided to ________ its operations to include all aspects of the clothing business.

A) multiply

B) lengthen

C) expand

D) stretch

2.His business was very successful, but it was at the ________ of his family life.

A) consumption

B) credit

C) exhaustion

D) expense

3.First published in 1927, the charts remain an ________ source for researchers.

A) identical

B) indispensable

C) intelligent

D) inevitable

4.Joe is not good at sports, but when it ________ mathematics, he is the best in the class.

A) comes to

B) comes up to

C) comes on to

D) comes around to

5.Doctors warned against chewing tobacco as a ________ for smoking.

A) relief

B) revival

C) substitute

D) succession

6.When carbon is added to iron in proper ________ the result is steel.

A) rates

B) thicknesses

C) proportions

D) densities

7.You should try to ________ your ambition and be more realistic.

A) reserve

B) restrain

C) retain

D) replace