居民消费的前提和基础是 [ ]
A．物价水平
B．收入
C．商品价格
D．储蓄
答案：B
Some children are too ________ about their food, which is bad for their growth.
A．careful
B．special
C．particular
D．curious
内部设计有筋板的箱形结构在装配时，应采取（）、（）和矫形。
