题目

阅读下面材料，用方框中所给单词的适当形式在空白处填空，每词限用一次，每空只能填一词。with quick one thing but be danger side watch whoMany years ago, there lived a very rich man. He wanted to do something nice for the people in his town. So he hoped to find out 【1】 was worth getting his help. 【2】 of all, he put a large stone in the center of the main road in the town. Then he hid behind a tree and 【3】.Soon a farmer came along 【4】 his cow. “Who put this stone in the center of the road?” said the farmer. But he did not remove the stone生活中有许多发热发光的现象。通过化学学习，你认为发热发光( )。A．一定是化学变化B．一定是燃烧C．一定发生了氧化反应D．通常是一种能量向另一种能量的转化