Examination time: 90 minutes, the total score of the test paper 130 points.

Name _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

Nationality _ _ _ _ _ _ _ _ School _ _ _ _ _ _ _

First, multiple-choice questions (5 points for each question, ***50 points)

1. Algebraic value ()

A. it's 0 B. It is between 0 and 1. C. between-1 and 0. D. equal to 1 or-1.

2. In order to make the score meaningful, the value range of is ()

A.x≠0 B. x≠0 and x≠ 1 C. x≠0 or x≠ 1 d.x ≠ 0 ≠ 0 and x ≠/kloc-0.

3. If the center of gravity of a triangle is on one of its high lines, then the triangle must be ().

A. isosceles triangle B. right triangle C. equilateral triangle D. isosceles right triangle

4. Let w = 7321× 7322× 7323× 7324+1,then w is ().

A. a square number B. a cubic number C. a prime number D. an even number

5. let x