题目

Shea baseball, but shea volleyball. A . isn't have; has B . doesn't have; have C . don't have; has D . doesn't have; has 答案：D为了减少“酸雨”的产生，下列措施中有效的是 [     ]①减少用煤作燃料 ②将燃料脱硫 ③把工厂的烟囱建高 ④开发新能源 A.①②③B.②③④C.①③④D.①②④