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