工程建设定额是由多种定额结合而成的有机整体,它的结构复杂、层次鲜明、目标明确。这体现了工程建设定额的()特点。
A.科学性
B.系统性
C.统一性
D.指导性
参考答案:B
Yesterday I __________ happy, too.[ ]
A. am
B. is
C. was
D. are
23. His interests extended _____ the fine arts to international politics and philosophy.
A.across
B.through
C.over
D.beyond