71) Since research studies have shown a relationship between cancer and cigarette smoking, many people have cut down.
(A) ceased smoking
(B) become frightened
(C) decreased the number of cigarettes
(D) gotten sick
72) It is not a good business policy to buy sleazy materials.
73) Lifting the shoulders is a gesture that indicates lack of interest.
74) Pipes may be painted to keep them from getting oxidized.
75) Interfering with someone's mail is a serious crime.
76) Athletes learn to conceal their disappointment when they lose.
77) Although monkeys occasionally menace their enemies, they are usually not dangerous unless they are provoked.
78) Valium is a strong drug that can cause a driver to sleep at the wheel.
79) Milk is purified by heating it at 60° C for thirty minutes.
80) The box fell off his desk and hit the floor with a thump.
(A) a dull noise
(B) a very small sound
(C) a musical sound
(D) a repeated noise