联合国能源机构的调查报告显示,()将是21世纪重要的新兴产业之一。
A.土木建筑业
B.节能建筑业
C.太阳能建筑业
D.钢材建筑业
参考答案:C
The experiment turned out to be ________, which wasn’t ______ they wanted.
A.a completely failing; as
B.a complete failure; what
C.completely failure; that
D.failed; 不填
毒物根据用途和来源分为:___________、___________、___________、_________。