砌体结构设计采用以（）理论为基础的极限状态设计方法，用度量结构的可靠度，用（）表达式进行设计。
参考答案：概率；分项系数
The elderly _________ good care of in public places like supermarkets and airports; they are likely to get lost.
A．can have been taken
B．ought to be taking
C．must be taken
D．should take
All in all, it is now beyond doubt that in size and scope the rapid global spread of the habit to wear jeans, however it may be explained, is an accident without precedent in the history of human attire.
A．of wearing... incident
B．wearing... event
C．of wearing... event
D．to be wearing... incident
