在窗体中添加一个名称为Command1的命令按钮，然后编写如下程序：

窗体打开运行后，单击命令按钮，则消息框的输出结果为（）。

A．10

B．30

C．40

D．50

The task at hand now is to (56) the programmers who still use yesterday’s software technology to solve today’s software problems. Object-oriented programming requires a new attitude toward problem (57) . Problem (57) with computer system becomes more natural. Application can (58) be translated into (59) . Although it is commonly believed that it will be easier to train new programmers to use object-oriented techniques than to (60) programmers who have substantial experience in applying conventional programming language constructs.

（58）是（）

A.indirectly

B.directly

C.smoothly

D.quickly