在土壤工程分类中，植物性土壤属于（）
A、一类土
B、二类土
C、三类土
D、四类土
参考答案：A
You ____ if you had spoken the truth out. But you were as quiet as a mouse.
A．mustn’t have been blamed
B．shouldn’t be blamed
C．wouldn’t have been blamed
D．couldn’t be blamed
世界上第一台电子计算机的名字是
A．ENIAC
B．ENIACAL
C．ENACIA
D．ENICAL
E．ENYCAL
