26. Barnes: The two newest employees at this company have salaries that are too high for the simple tasks normally assigned to new employees and duties that are too complex for inexperienced workers. Hence, the salaries and the complexity of the duties of these two newest employees should be reduced.

　　Which one of the following is an assumption on which Barnes's argument depends?

　　(A) The duties of the two newest employees are not less complex than any others in the company.

　　(B) It is because of the complex duties assigned that the two newest employees are being paid more than is usually paid to newly hired employees.

　　(C) The two newest employees are not experienced at their occupations.

　　(D) Barnes was not hired at a higher-than-average starting salary.

　　(E) The salaries of the two newest are no higher than the salaries that other companies pay for workers with a similar level of experience.

　　27. These days, drug companies and health professionals alike are focusing their attention on cholesterol in the blood. The more cholesterol we have in our blood, the higher the risk that we shall die of a heart attack. The issue is pertinent since heart disease kills more North Americans every year than any other single cause. At least three factors——smoking, drinking, and exercise-can each influence levels of the cholesterol in the blood.

　　Which one of the following can be properly concluded from the passage?

　　(A) If a person has low blood cholesterol, then that person's risk of fatal heart disease is low.

　　(B) Smoking in moderation can entail as great a risk of fatal heart disease as does heavy smoking.

　　(C) A high-cholesterol diet is the principal cause of death in North America.

　　(D) The only way that smoking increases one's risk of fatal heart disease is by influencing the levels of cholesterol in the blood.

　　(E) The risk of fatal heart disease can be altered by certain changes in lifestyle.

　　28. Ordinary mountain sickness, a common condition among mountain climbers, and one from which most people can recover, is caused by the characteristic shortage of oxygen in the atmosphere at high altitudes. Cerebral edema, a rarer disruption of blood circulation in the brain that quickly becomes life-threatening if not correctly treated from its onset, can also be caused by a shortage of oxygen. Since the symptoms of cerebral edema resemble those of ordinary mountain sickness, cerebral edema is especially dangerous at high altitudes.

　　Which one of the following is an assumption on which the argument depends?

　　(A) The treatment for ordinary mountain sickness differs from the treatment for cerebral edema.

　　(B) Cerebral edema can cause those who suffer from it to slip into a coma within a few hours.

　　(C) Unlike cerebral edema, ordinary mountain sickness i

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