GRE北美题No9-3.docVIP

SECTION 7 Questions 1-6 Seven airline flights—101, 102, 103, 104, 105, 106, and 107—are to be scheduled for departure, one at a time on the hour, from 9:00 a.m. until 3:00 p.m. The schedule must conform to the following requirements: Flight 101 must depart at 9:00 am. Flight 105 must depart later than Flight 103, and also later than Flight 102. Flights 104, 106, and 107 must depart on consecu- tive hours in that order. 1. If Flight 107 is scheduled to depart at noon, Flight 105 must be scheduled to depart at (A) 10:00 a.m. (B) 11:00 a.m. (C) 1:00 p.m. (D) 2:00 p.m. (E) 3:00 p.m. 2. If Flights 103 and 104 are scheduled to depart at 11:00 a.m. and 12 noon, respectively, Flight 102 must be scheduled to depart at (A) 9:00 a.m. (B) 10:00 a.m. (C) 1:00 p.m. (D) 2:00 p.m. (E) 3:00 p.m. 3. Which of the following lists three flights in a sequence, from first to last, in which they could be scheduled to depart consecutively? (A) 101, 104, 103 (B) 102, 103, 106 (C) 104, 105, 106 (D) 106, 107, 103 (E) 106, 107, 104 4. If Flight 106 is scheduled to depart at 2:00 p.m., Flight 105 must be scheduled to depart at (A) 10:00 a.m. (B) 11:00 a.m. (C) 12 noon (D) 1:00 p.m. (E) 2:00 p.m. 5. Which of the following must be true about the scheduled order of the flights? (A) Flight 103 is scheduled to depart later than Flight 102. (B) Flight 104 is scheduled to depart later than Flight 103. (C) Flight 105 is scheduled to depart later than Flight 104. (D) Flight 106 is scheduled to depart later than Flight 105. (E) Flight 107 is scheduled to depart later than Flight 106. 6. What is the latest hour at which Flight 102 can be scheduled to depart? (A) 10:00 a.m. (B) 11:00 a.m. (C) 12 noon (D) 1:00 p.m. (E) 2:00 p.m. 7. In an experiment, two hundred mice of a strain that is normally free of leukemia were given equal doses of radiation. Half the mice were then allowed to eat the