On a map of the eastern and western hemispheres with a scale of "1 cm represents a distance of 1000 km in the field", the length of the equator should be () A. 20 cm B. 40 cm C. 80 cm D. 10 cm

The circumference of the equator is 40000 km, that is 4000000000 cm. The text scale is converted into a digital scale of 1:100000000. According to the scale = distance on the map: distance on the field, we can get: distance on the map = distance on the field × scale = 4000000000 × 1100000000 = 40cm

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