Topic content:
Among the following pairs of quantities, ()
A. Temperature increases by 3 ℃ and decreases by 5 ℃
B. 3 wins and 2 losses
C. Forward 1m and backward 3m
D. Profit of 30000 yuan and expenditure of 20000 yuan
Best answer:
A、 This option is wrong because the temperature increases by 3 ℃ and decreases by 5 ℃;
B、 This option is wrong because winning 3 games is opposite to losing 2 games;
C、 This option is wrong because it has the opposite meaning between advancing 1m and retreating 3m;
D、 Profit and loss are opposite, but not opposite to expenditure, so this option is correct;
Therefore, D
Answer analysis:
There is no explanation for this question
Test core:
Positive Number: negative number (real number) greater than 0: negative number (real number) less than 0 is neither positive nor negative.
Non negative number: positive number and zero. Non positive number: negative number and zero.