Q8:Which of the following most logically completes the passage?

Garnet and RenCo each provide health care for their employees.  Garnet pays for both testing of its employees’ cholesterol levels and treatment of high cholesterol.  This policy saves Garnet money, since high cholesterol left untreated for many years leads to conditions that require very expensive treatment.  However, RenCo dose not have the same financial incentive to adopt such a policy, because ______.

A.     early treatment of high cholesterol dose not entirely eliminate the possibility of a stroke later in life

B.     the mass media regularly feature stories encouraging people to maintain diets that are low in cholesterol

C.     RenCo has significantly more employees than Garnet has

D.     RenCo’s employees are unlikely to have higher cholesterol levels than Garnet’s employees

E.      the average length of time an employee stays with RenCo is less than it is with Garnet

the answer is E,but both D and E seems reasonable,how to eliminate D? 

e中说明了为什么R不用这个政策的原因,就是R的工人用工期短, 所以不可能出现长期工作导致生病的情况

而d说明原因的程度没有e强

现在想明白了，D只是说R公司unlikely to have higher cholesterol levels ，而不是说have much lower cholesterol levels

high cholesterol left untreated for many years leads to conditions that require very expensive treat题中说说由于高胆固醇长时间不治疗导致高额的治疗费

D ：R公司员工胆固醇不会比G公司高，所以有可能R公司员工胆固醇跟G公司的员工差不多高，还是有可能导致高额医疗费；

E：R公司员工在公司不会像G公司员工呆很长时间，所以即使胆固醇很高，长时间不治疗导致高额的治疗费也不会由R来承担，因为员工需要高额的治疗费时已经离开公司了。