活塞式压缩机按汽缸的排列方式分，（）活塞式压缩机的轴线在空间呈直立布置。
A、对置式
B、对称对置式
C、卧式
D、立式
参考答案：D
Since time began, it seems, people have been putting off______they______have done today, scolding themselves in the meantime．
A．that, must
B．that, should
C．what, could
D．what, would
当玛莎提交关于不安全的工作条件一个正式的投诉，她充当了（）。
A.功利主义思想家
B.法官
C.创造性的思想家
D.告密者
E.人道主义
