石油中含量最高的元素是（）
A、C
B、H
C、O
参考答案：A
对于工程规模较大或较复杂的工程的施工进度计划宜采用（）表示。
A.横道图
B.网络图
C.双代号网络图
D.单代号网络图
25．---It was careless of you to have left your clothes outside all night.
---My God! __________.
A．So did I
B．So I did
C．So were you
D．So did you
