1.If n is any prime number greater than 2, which of the following cannot be a prime number?
A.n-4
B.n-3
C.n-1
D.n 2
E.n 5
答案：E
2.If the range of the six measurements 140, 125, 180, 110, 165, and x is 80, which of the following could be the value of x?
A.60
B.85
C.190
D.220
E.245
答案:C
3.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
答案：C
4.On a certain number line, if-7 is a distance 4 from n and 7 is a distance of 18 from n then n=
A.25
B.11
C.3
D.-3
E.-11
答案：E
5. Which of the following equations can be used to find the value of x if 7 less than 5x is 5 more the product of 3 and x?
A.5x-7=5 3x
B.5x-7=5 (3 x)
C.7-5x=5 3x
D.7-5x=(5 3)x
E.7-5x 5=3x
答案：A
6.On a number line, the distance between the two points with coordinates -5 and 1 is how much less than the distance between the two points with coordinates 2 and 14?
A.6
B.8
C.10
D.12
E.16
答案：A
7.The expression (4 x)(2x-3) is equivalent to which of the following?
(1)2x(x 4)-3(x 4)
(2)(x-4)(2x 3)
(3)2x2-12
A.(1) only
B. (2) only
C. (3) only
D. (2) and (3)only
E. (1),(2) and (3)
答案;A
8.On the number line, 1.4 is halfway between which of the following pairs of numbers?
A.-1.4 and 2.4
B.-1 and 2
C.-0.3 and 3.1
D.0.15 and 1.55
E.0.4 and 1
答案：C
9.If the sum r s is 2 less than the difference r-s, then s=
A.-2
B.-1
C.0
D.1
E.2
答案：B
10.The value of y will decrease as the value of x increases in which of the following equations?
A.y=x
B.y=x-2
C.2-y=3-x
D.2x-y=4
E.x 2y=1
答案：E
11.What is the cost, in cents, of using a certain fax machine to send n pages of a report if the total cost for sending the first k pages is r cents and the cost for sending each additional page is s cents?(assume that n>k)
A.r s(n-k)
B.r s(n k)
C.rs(n k)
D.kr s(nk)
E.kr ns
答案：A
