单项选择题

When 9 students took a zoology quiz with a possible score of 0 to 10 inclusive, their average (arithmetic mean) score was 7.5. If a tenth student takes the same quiz, what will be the least possible average score on the quiz for all 10 students （）

A.6.5
B.6.75
C.7.0
D.7.25
E.7.5

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单项选择题
If a and b are the lengths of the legs of a right triangle whose hypotenuse is 10 and whose area is 20,what is the value of (a +b.2)（）

A.100
B.120
C.140
D.180
E.200
单项选择题
The water level in a tank is lowered by 6 inches, then raised by inches, and then lowered by 4 inches. If the water level was x inches before the changes in level, which of the following represents the water level, in inches, after the changes （）

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