雅思语法模拟练习题(11)

　　51. When carbon is added to iron in proper ______the result is steel.

　　A) rates B) thicknesses C) proportions D) densities

　　52. You should try to ______ your ambition and be more realistic.

　　A) reserve B) restrain C) retain D) replace

　　53. Nancy is only a sort of ______ of her husband's opinion and has no ideas of her own.

　　A) sample B) reproduction C) shadow D) echo

　　54. Now that spring is here, you can ______ these fur coats till you need them again next winter.

　　A) put over B) put away C) put off D) put down

　　55. There is a _____ of impatience in the tone of his voice.

　　A) hint B) notion C) dot D) phrase

　　51.C) proportions 52.B) restrain 53.D) echo 54.B) put away 55.A) hint