11. When a person is under intense psychological stress, his or her cardiovascular response is the same as it is during vigorous physical exercise. Psychological stress, then, must be beneficial for the heart as is vigorous physical exercise.
The argument above relies on which of the following assumptions?
(A) Exercise is an effective means of relieving psychological stress.
(B) The body’s short-term cardiovascular response to any activity indicates that activity’s long-term effect on the body.
(C) Cardiovascular response during an activity is an adequate measure of how beneficial the activity is for the heart.
(D) Psychological stress can have a positive effect on the body.(C)
(E) Vigorous exercise is the most reliable method of maintaining a healthy heart.
18. Manager: Accounting and Billing are located right next to each other and the two departments do similar kinds of work; yet expenditures for clerical supplies charged to Billing are much higher. Is Billing wasting supplies?
Head of Billing: Not at all.
Which of the following, if true, best supports the position of the Head of Billing?
(A) There are more staff members in Accounting than in Billing.
(B) Two years ago, expenditures in Accounting for clerical supplies were the same as were expenditures that year in Billing for clerical supplies.
(C) The work of Billing now requires a wider variety of clerical supplies than it did in the past.
(D) Some of the paper-and-pencil work of both Accounting and Billing has been replaced by work done on computers.(E)
(E) Members of Accounting found the clerical supplies cabinet of Billing more convenient to go to for supplies than their own department’s cabinet.
拜托帮忙解释一下,实在是搜不到解释  
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