C. only
D.andonly
E. ,and
答案:D
25.The product of two consecutive positive integers cannot be
A. a prime number
B. divisible by 11
C. a multiple of 13
D. an even number less than 10
E. a number having 4 as its units digit.
答案:E
26.When a certain number is divided by 7, the remainder is 0. If the remainder is not 0 when the number is divided by 14, then the remainder must be
A.1
B.2
C.4
D.6
E.7
答案:E
27.How many of the positive integers less than 25 are 2 less than an integer multiple of 4?
A.2
B.3
C.4
D.5
E.6
答案:E
28. If y is the average of n consecutive positive integers, n1,what is the sum of the greatest and least of these integers?
A. 2y
B. ny
C. y/2
D. y/n
E.2n/y
答案:A
29.A positive integer with exactly two different divisors greater than 1 must be
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