单项选择题

A．reason
B．cause
C．problem
D．purpose
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在现代条件下，这需要程度不同的中央控制，从而就需要获得诸如经济学家和运筹学家等专家的协助。[精解] Under modern conditions，this requires varying measures of centralized control and hence the help of specialized scientists such as economists and operational research expels．句子分析：一、句子可以拆分为三段：Under modern conditions，this requires varying measures of centralized control and hence the help of specialized scientists such as economists and operational research experts．二、句子的结构：1)主干结构是一个带双宾语的简单句：this requires varying measures of．．．and hence the help of．．．2)两个宾语各带有of 短语作定语。3)specialized scientists 后面的短语such as．．．是其定语。三、词的处理：Under modern conditions 在现代条件下；requires 需要；varying measures (程度)不同的措施；centralized control 中央控制，中央调控；and hence 因此，从而；specialized scientists 专门科学家，专家；operational research experts 运行研究专家，运筹学家。
单项选择题
A．informB．be informedC．to be informedD．informed
A．inform
B．be informed
C．to be informed
D．informed
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