GRE Text Completion Question 3570
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Source: NO9
Since many casual smokers develop lung cancer and many (i)_____ smokers do not, scientists believe that individuals differ in their (ii)_____ the cancer-causing agents known to be present in cigarette smoke.
- A heavy.. susceptibility to
- B chronic.. concern about
- C habitual.. proximity to
- D devoted.. reliance upon
- E regular.. exposure to