2. 外语
  3. Each of Questions 1 to 7 presents two quantities. Quantity A and Quantity B. Compare the two quantities. You may use additional

Each of Questions 1 to 7 presents two quantities. Quantity A and Quantity B. Compare the two quantities. You may use additional

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问题 Each of Questions 1 to 7 presents two quantities. Quantity A and Quantity B. Compare the two quantities. You may use additional information centered above the quantities if such information is given. Choose one of the following answer choices:
A if Quantity A is greater;
B if Quantity B is greater;
C if the two quantities are equal;
D if you cannot determine the relationship based on the given information.

选项 A、 
B、 
C、 
D、 
答案D
解析 The correct answer is D. To solve this problem, try some test values for r, s, and t. Because it is given in the problem that they are negative numbers, r<0, s<0, and r<0. Let r=-1, s=-2 and f=-4. The sum is -7(-1+-2+-4), but the product is -8(-1x-2x-4), making the product less than the sum. Now, let r=-0.5, s=-l and r=-2. The sum is -3.5(-0.5+-1+-2), but the product is -1(-0.5×-l×-2), making the product greater than the sum. Therefore, you cannot determine the relationship based on the given information.
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