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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单项选择题
At College C there are from 2 to 4 introductory philosophy classes each semester，and each 0f these classes has from 20 to 30students enrolled．If one semester 10 percent of the students enrolled in introductory philosophy failed，what is the greatest possible number who failed（）

A. 12
B. 10
C. 8
D. 6
E. 3
单项选择题
A certain spiral staircase is designed so that each step after the first one is turned 20°counterclockwise from the one immediately below it，how many of the steps make upcomplete revolutions（）

A. 18
B. 36
C. 38
D. 45
E. 50
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