多层建筑施工,在计划安排上确须进行立体交叉作业时,应事先采取()防护措施。
A.有效
B.防范
C.隔离
D.安全
参考答案:C
(2013·高考辽宁卷)Briggs will ________as general manager when Mitchell retires.
A.get away
B.take over
C.set off
D.run out
— What does the fresh juice contain?
— ________of the juice ________ orange. It's very pure.
A.Four-fifth; are
B.Four-fifths; are
C.Four-fifth; is
D.Four-fifths; is