单项选择题

Questions 10—11 are based on the following:
Antinuclear activist: The closing of the nuclear power plant is a victory for the antinuclear cause. It also represents a belated acknowledgment by the power industry that they cannot operate such plants safely.
Nuclear power plant manager: It represents no such thing. The availability of cheap power from nonnuclear sources, together with the cost of mandated safety inspections and safety repairs, made continued operation uneconomic. Thus it was not safety considerations but economic considerations that dictated the plant’s closing. For a group of n people, k of whom are of the same sex, the expression
yields an index for a certain phenomenon in group dynamics for members of that sex. For a group that, consists of 20 people, 4 of whom are females, by how much does the index for the females exceed the index for the males in the group

A. 0.05
B. 0.0625
C. 0.2
D. 0.25
E. 0.6

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单项选择题If n=p+r, where n, p, and r are positive integers and n is odd, does p equal 2 (1)p and r are prime numbers. (2)r≠2

A. 条件(1)充分，但条件(2)不充分．
B. 条件(2)充分，但条件(1)不充分．
C. 条件(1)和(2)单独都不充分，但条件(1)和条件(2)联合起来充分．
D. 条件(1)充分，条件(2)也充分．
E. 条件(1)和条件(2)单独都不充分，条件(1)和条件(2)联合起来也不充分．

单项选择题At the company picnic, all of the employees who participated in more than four of the scheduled events, and only those employees, were eligible for the raffle held at the end of the day. Since only a small proportion of the employees were eligibly for the raffle, most of the employees must have participated in fewer than four of the scheduled events. Which one of the following arguments exhibits a flawed pattern of reasoning most like that exhibited by the argument above

A. Only third-and fourth-year students are allowed to keep cars on campus. Since one quarter of the third-year students keep cars on campus and one half of the fourth-year students keep cars on campus, it must be that fewer third-year students than fourth-year students keep cars on campus.
B. Only those violin students who attended extra rehearsal sessions were eligible for selection as soloists. Since two of the violin students were selected as soloists, those two must have been the only violin students who attended the extra sessions.
C. The only students honored at a special banquet were the band members who made the dean’s list last semester. Since most the band members were honored, most of the band members must have made the dean’s list.
D. All of the members of the service club who volunteered at the hospital last summer were biology majors. Since ten of the club members are biology majors, those ten members must have volunteered at the hospital last summer.
E. All of the swim team members who had decreased their racing times during the season were given awards that no other members were given. Since fewer than half the team members were given such awards, the racing times of more than half the team members must have increased during the season.