Stressful environments lead to some unhealthy behavior such as a poor eating habit, which _____ increases

the risk of heart disease. [ ]

A. in turn

B. in return

C. by chance

D. by turns

对于一般工业和民用建筑工程而言，单位工程概算按其工程性质分为建筑工程概算和( )两大类。

A．一般土建工程概算
B．设备及安装工程概算
C．工器具及生产家具购置费用概算
D．弱电工程概算