单项选择题

If 9 trees are originally planted in a circular pattern as shown above，what is the least number of trees that must be transplanted so that the 9 trees will be in 2 straight rows（）

A. 4
B. 5
C. 6
D. 7
E. 8

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单项选择题

A rectangular rug covers half of a rectangular floor that is 9 feet wide and 12feet long．If the dimensions of the rug are in the same ratio as those of the floor，how many feet long is the rug（）

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

单项选择题

There are six marked points on the circle above． How many different lines can be drawn that contain two of the marked points（）

A. 5
B. 6
C. 12
D. 15
E. 30

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