Cancer-causing agents (called carcinogens) in work environments
a. are prevalent today in spite of known links to cancer deaths.
b. have been virtually eliminated because of the great amount of research in cancer prevention.
c. still exist although unsafe chemical additives in foods are no longer a problem.
d. have caused cancer in few if any workers.
Question 2
College students
a. represented a cross-section of the population in the early decades of the 20th century.
b. today disproportionately come from lower-income families.
c. represented a much broader spectrum of U.S. society after World War II than before the war because of the G.I. bill.
d. represented a much broader spectrum of U.S. society before World War II than since that time.
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