1. (3 points) If $a \div 0.3=0.6$, then $a=(\quad)$
A. 2
B. 1
C. 0.2
D. 0.18
【Analysis】Since $a \div 0.3=0.6$, according to "dividend = quotient \times divisor", then $a=0.3 \times 0.6$, calculating the result will suffice.

【Solution】Solution: $0.3 \times 0.6=0.18$;
Therefore, the correct choice is: D.