A.0 B. 1 C. 2 D.3

2. The solution set of inequality 1 ≤| x-3 |≤ 6 is ()

A.{x |-3 ≤ x ≤ 2 or 4 ≤ x ≤ 9} B. {x |-3 ≤ x ≤ 9}

C.{ x |- 1≤x≤2 } d . { x | 4≤x≤9 }

3. given the set a = {x || x- 1 | < 2} and b = {x || x- 1 | > 1}, then A∩B is equal to ().

A.{x |- 1 < x < 3} B. {x | x < 0 or x > 3}

C. {x |-1< x < 0} D. {x |-1< x < 0 or 2 < x < 3}

4. It is known that the equation X (m+3) x2-4mx+2m- 1 = 0 has two different signs, and the absolute value of the negative root is greater than the positive root, so the value range of the real number m is ().

A.-3 < m < 0 b.m 0

C.0 < m < 3 d.m < 0 or m > 3

5.A, B, C, D, E * * *, five students play chess together, and only 1 disc is played between every two students. During the competition, count the number of matches: A played 4 sets, B played 3 sets, C played 2 sets and D played 1 set, so classmate E played () set.

1 (B)2 (C)3 (D)4

6. Let f(x) be the odd function on R, and increase on (0, +∞). If f (0.5) = 0 and f (log4x) > 0, then x's.

The value range is ()

A.x > 2 or < x <1b.x > 2 C. < x <1d. < x < 2.

7. It is known that the function y=f(x) whose domain is r is a decreasing function on (0,4) and y=f(x+4) is an even function, then ().

A.f(5)