Most good writers use every means ______ to make the reader's way smooth and easy.
A. at their disposal
B. at their request
C. at their will
D. at their convenience
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袋中有几个球，取球规则是“每次取出袋中的一半后再放进一个”，算取一次，取了 832次后，袋中剩2个，则原袋中有( )个。
A. 2
B. 18
C. 4
D. 6
有一个边长为6米的正三角形的草地，若在其周围每隔2米种1棵树，那么可种( )棵。
A. 8
B. 9
C. 11
D. 10
古立克认为，负责监督和调整专家、政府官僚和利益集团三者间关系的是( )
A. 政治家
B. 政治任命官
C. 行政官
D. 技术人员
______, she led a life of complete seclusion.
A. Being disgraced
B. Disgraced
C. Disgracing
D. She was disgraced
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