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. If x is a positive, single-digit integer such that
2x, x, and x+2, and 3x-2 form a non-ordered list of consecutive integers, which of the following could be the median of that list

A. 3
B. 4
C. 5
D. 6
E. 8

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单项选择题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

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．