单选

●编译器和解释器是两种高级语言处理程序，与编译器相比， (29) 。编译器对高级语言源程序的处理过程可以划分为词法分析、语法分析、语义分析、中间代码生成、代码优化、目标代码生成等几个阶段：其中，代码优化和 (30) 并不是每种编译器都必需的。词法分析的作用是识别源程序中的 (31) ；语法分析中的预测分析法是 (32) 的一种语法分析方法；编译器在 (33) 阶段进行表达式的类型检查及类型转换。
(29)

A．解释器不参与运行控制，程序执行的速度慢 &n
bsp; B．解释器参与运行控制，程序执行的速度慢
C．解释器参与运行控制，程序执行的速度不变
D．解释器不参与运行控制，程序执行的速度快 (30) A．词法分析
B．语义分析
C．中间代码生成
D．语法分析 (31) A．字符串
B．单词
C．语句
D．标识符 (32) A．自左至右
B．自顶向下
C．自底向上
D．自右至左 (33) A．词法分析
B．语法分析
C．语义分析
D．中间代码生成

试题出自试卷《2011年程序员考试考前密卷（四）-上午试题》

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