题目内容:
WhydoesDr.Johnsonwanttouseagas-burningplant?
A.Itgeneratesmorehotair. B.Itproducesmorecarbondioxide.
C.Itdoesnotdumpsulfurdioxideintotheair.
D.Itdoesnotreleasepollutantsintotheair.
参考答案:
答案解析: