继承性

照样子，把句子写具体。

例：同学们来到操场。    

同学们迅速地来到操场。

1．一只小手举起来。  

一只小手（    ）举起来。

2．小男孩躺在草垫上。  

小男孩（    ）躺在草垫上。

Because he didn't finish the work on time and was fired by the company, he was very ______ about it. [ ]

A. upset

B. worrying

C. anxious

D. nervous

数据挖掘过程的参考模型的步骤包括（）。

A.定义商业问题

B.建立数据挖掘库

C.分析、准备数据

D.建立模型

E.评价和解释

F.实施

There is a 30% chance that the economy will be good and a 70% chance that it will be bad. If the economy is good, your returns will be 20% and if the economy is bad, your returns will be 10%. What is your expected return（）

A. 15%.

B. 17%.

C. 13%.

阅读时的视力叫近视力，其距离为：（）

A.10cm

B.15cm

C.20cm

D.25cm

E.30cm