四大菜系中数（）菜系的点心最有名。
A.苏菜
B.粤菜
C.川菜
D.鲁菜
参考答案：A
She was so ________ that she wouldn't give in until she received a full apology.[ ]
A. simple
B. lucky
C. stubborn
D. proper
两样本均数比较的假设检验，按α＝0.05水准，认为差异有显著性，此时若推断有错，其错误的概率是
A．大于0.05B．小于0.05C．等于0.05D．β，而具体数值未知E．1-β
