Prior to the UML, there was no clear leading （） language. Users had to choose from among many similar modeling languages with minor differences in overall （） power. Most of the modeling languages shared a set of commonly accepted concepts that are expressed slightly differently in various languages. This lack of （） discouraged new users from entering the OO market and from doing OO modeling, without greatly expanding the power of modeling. Users longed for the industry to adopt one, or a very few, broadly supported modeling languages suitable for （） usage. Some vendors were discouraged from entering the OO modeling area because of the need to support many similar, but slightly different, modeling languages. In particular, the supply of add-on tools has been depressed because small vendors cannot afford to support many different formats from many different （） modeling tools. It is important to the entire OO industry to encourage broadly based tools and vendors, as well as niche products that cater to the needs of specialized groups.

minor differences in overall （） power

A．control

B．expressive

C．conductive

D．interactive

定义：
①成语：语言中经过长期使用、锤炼而形成的固定短语。成语是表示一般概念的固定词组或句子，绝大部分是由四个字组成的。
②谚语：流传于民间的比较简练而且言简意赅的话语。民间集体创造、广为口传、言简意赅并较为定型的艺术语句，是民众丰富智慧和普遍经验的规律性总结。谚语包括：认识自然和总结生产经验的谚语；认识社会和总结社会活动经验的谚语；总结一般生活经验的谚语。
③歇后语：具有独特艺术结构形式的民间谚语，它由两部分组成，前面是假托语，是比喻；后面是目的语，是说明。分为寓意的和谐音的两种，主要用来表现生活中的某种情景和人们的某种心理状态。
典型例证：
(1)空中楼阁
(2)老虎戴数珠——假慈悲
(3)天下乌鸦一般黑
上述典型案例与定义存在对应关系的数目有( )。

A．0个
B．1个
C．2个
D．3个