题目

Once, a king showed two men a large basket in the garden. He told them to fill it with water from a well. After they __1__ their work, he left them, saying, “When the sun is down, I will come and see your work.” At last one of them said, “What’s the use of doing this foolish work? We can __2__ fill the basket.” __3__ man answered, “That is none of your business.” The first man said. “You may do as you like, but I am not going to work at __4__ so foolish.” He __5__ his bucket and went away. The other man said no word, and kept on carrying __6__. At last the well was al在一块并排10垄的田地中，选择2垄分别种植A、B、两种作物，每种作物种植一垄。为有利于作物生长，要求A、B两种作物的间隔不小于6垄，则不同的选垄方法共有________种（用数字作答）