GRE北美题No10-1.docVIP

No.9 第四套 Section 2 Questions 1-4 A group of three objects must be selected from six objects—K, O, S, T, V, and W—according to the following conditions: Either K or S, or both, must be selected. Either O or V must be selected, but neither V nor S can be selected with O. 1. Which of the following is an acceptable selection of objects? (A) K, O, and S (B) K, S, and T (C) K, S, and V (D) O, S, and V (E) O, T, and V 2. Which of the following pairs of objects CANNOT both be among the objects selected? (A) K and O (B) K and T (C) O and W (D) T and W (E) V and W 3. If S is selected, which of the following must also be among the objects selected? (A) K (B) O (C)T (D) V (E) W 4. If V is not selected, which pair of objects must be among those selected? (A) K and O (B) K and T (C) K and W (D) O and T (E) O and W 5. Research has proved that eating lots of fish greatly decreases the risk of developing heart disease. The key factor providing protection has been identified as omega-3 fatty acids, a family of fatty acids found in fish oils. Therefore, if people take dietary sup- plements of omega-3’s in capsule form, they will decrease their risk of developing heart disease. Which of the following, if true, would most seriously weaken the conclusion drawn above? (A) Some dietary supplements have been shown to have harmful side effects. (B) Omega-3’s occur in extremely low quantities in some kinds of fish. (C) Omega-3’s are effective only because they interact with other substances found mainly in fish. (D) The majority of people who eat fish say that they do so because they like the taste of fish. (E) Researchers have found evidence that fish oil supplements would also reduce the effects of asthma and arthritis for some persons. 6. It is no wonder that some domestic car companies have to attract potential buyers with rebates and low interest rates. Why d