28- The passage states that A)there has always been abundant evidence that smoking causes cancer
B) almost all smokers develop lung cancer
C) lung cancer was not very common among smokers until 1950s
D) smokers tend to use all 6ther drugs, including alcohol
E) it took a long time for people to believe that smoking was dangerous
29-Tohacco…………… . A) was known to cause lung cancer even before the 1950s
B) has become more dangerous every decade since the 1950s
C) is less dangerous to the health than alcohol
D) causes more illness than all other drugs
E) is related to most cases of heart disease
