2, 1,15,2 hectares, 500 square meters, 1250 square centimeters, 2.05L=2050.

3、BDB

4, 26 episodes

5 60/5 3= 100

100 ÷ 80 =1.251.25×130 =162.5 (km) is greater than 100 km.

A: Timely.