英语学习资料：2015年12月四级词汇和语法模拟试题（13） 以下文字资料是由小编为大家搜集整理后发布的内容，让我们赶快一起来看一下吧！
1.The board of the pany has decided to ________ its operations to include all aspects of the clothing business.
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) es to
B) es up to
C) es on to
D) es 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
英语学习资料：2015年12月四级词汇和语法模拟试题（13）
