Where would this paragraph most probably appear?
   A．A medical magazine.    B．An encyclopedia.
   C．A biography.    D．A doctor dissertation.

地下连续墙施工时，应对泥浆的主要技术性能指标（）进行检验和控制。

A.比重
B.黏度
C.含砂率
D.pH值
E.膨润土含量

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Vanguard in the last sentence of the third paragraph may probably mean ______. A．importance B．history C．pioneer D．industry

A.

B.importance
C.history

D.pioneer

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