The Persians started to build roads about . The Greeks were not interested in building roads because .

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问题 The Persians started to build roads about ______.
The Greeks were not interested in building roads because ______.

选项 A、they didn’t want the city-states to be dependent on one another
B、they thought the roads between the cities were not good enough
C、they liked the natural landscape full of mountains
D、they could easily reach other lands by sea