1. The expression $\frac{1+0.25}{2 \times \frac{3}{4}-0.75}+\frac{3 \times 0.5}{1 \frac{1}{2}+3}$ equals ( )
A. 3
B. 2
C. 1
D. 0
1. Solution: Original expression $=\frac{1.25}{0.75}+\frac{1.5}{4.5}=\frac{5}{3}+\frac{1}{3}=2$ Answer: $B$