单项选择题

A gardener wishes to plant 5 bushes in a straight row．Each bush has flowers of a different solid color(white，yellow，pink，red，and purple.．How many ways can the bushes be arranged so that the middle bush is the one with red flowers（）

A. 24
B. 30
C. 60
D. 96
E. 120

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单项选择题
A square dart board has four dark circular regions of radius 3 inches，as shown in the design above．Each point on the dart board is equally likely to be hit by a dart that hits the board．What is the probability that a dart that hits the board will hit one of the circular regions（）

A.A
B.B
C.C
D.D
E.E
单项选择题
Three red marbles and 2 white marbles are placed in an empty box．One marble at a time is to be selected randomly and removed from the box until all 5 marbles have been removed． What is the probability that each of the first 3 marbles removed will be red（）

A.A
B.B
C.C
D.D
E.E
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