建筑施工中，混凝土配合比应为( )比。
A．重量
B．体积
C．密度
D．水灰
参考答案：A
解析： 建筑施工中，混凝土配合比应为重量比。
He has been doing the job for many years, but has never felt ________ it, though his workmates think it is a ________ one．
A．tired of; tired
B．tired of; tiring
C．tiring of; tired
D．tiring of; tiring
The beautiful mountain village _____ we spent our holiday last year is located in _____ is now
part of Guangxi.[ ]
A. which; where
B. where; what
C. that; what
D. when; which
