One. The choice is inscribed (the following in 4 choices of every problem, only one is correct)
1. - the absolute value of 7 is ()
(A) - 7 (B) 7 (C) -
(D)
2. 1999 -
the value is equal to ()
(A) - 2001 (B) 1997 (C) 2001 (D) 1999
3. There are 4 propositions below:
① exists and exist only integer and its contrary number is same.
The contrary number that ② exists and is put in a rational number and it only is same.
③ exists and exist only integer and its reciprocal is identical.
The reciprocal that ④ exists and is put in a rational number and it only is identical.
Among them correct proposition is: ()
(A) ① and ② (B) ② and ③
(C) ③ and ④ (D) ④ and ①
4.4ab
C
similar terms is ()
(A) 4bc
A
(B) 4ca
B
(C)
Ac
B
(D)
Ac
B
5. Some factory produced the crop of some product to reduce 20 ％ than June July, if the product wanted to achieve the yield June August, criterion the crop August should increase than July ()
(A) 20 ％ (B) 25 ％ (C) 80 ％ (D) 75 ％
6. 
, 