题目内容

Thousands of ______ at the stadium came to their feet to pay tribute to an outstanding performance.

A. audience
B. participants
C. spectators
D. observers

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Teachers in this school were encouraged to use drama as a(n) ______ of learning.

A. design
B. instrument
C. agency
D. tool

This is not the right ______ to ask for my help; I am far too busy even to listen!

A. moment
B. situation
C. opportunity
D. circumstance

We stood still, gazing out over the limitless ______ of the desert.

A. space
B. expanse
C. stretch
D. land

混悬剂中使微粒Zeta电位增加的电解质是( )。

A. 润湿剂
B. 反絮凝剂
C. 絮凝剂
D. 助悬剂
E. 稳定剂

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