1. Selection:1.b2.a3.c4.c5.c6.c7.c8.c9.d10.a.

Two. Fill in the blanks:

1 1. Water level drops 15cm.

12. I forgot, I won't,

13.3 10 degree

14. Unqualified

15.2 or 6

16.7

17. 1005

18.0

Three. Answer:

19. Positive integer (+2, 17) integer (+2, 3, 0, 1 4, 17) negative score (-3 and a half1).

20.-7+ 1 1-9=4-9=-5

The second paper

1. Choice:1.c2. Forgot what a rational number is, not 3.d4.b5.c6.d

Two. Fill in the blanks:

65438+3/4

2. Negative numbers

3.6 or -6 4 or -2

4.65438+7 00 0.375