单项选择题

Saplings are to be planted 30 feet apart along one side of a straight lane 455 feet long．If the first sapling is to be planted atone end of the lane，how many saplings are needed（）

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

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单项选择题
The 10 households on a certain street have household incomes that range from$34，000 to$150，000 and an average(arithmetic mean)household income of$60，000．If the household with the highest income and the one with the lowest income are excluded．What is the average household income for the remaining 8 households（）

A. $41，600
B. $47，000
C. $52，000
D. $61，000
E. $75，000
单项选择题
In a list of numbers，the first number is 3，the second is 4，and each subsequent humber is the sum of all the preceding numbers in the list．If the 20th number in the list is x，what is the 25th number in the list（）

A. 7x
B. 16x
C. 32x
D. 35x
E. 161x
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