"Another's brass", as used in this selection, means _________.
A. borrowed money
B. the arrogance of some people
C. a special kind of metal used in building
D. ornaments worn by some women
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点（1，2）是函数z=∣（x-1）（y-2）∣-2的（）
A. 极小值点
B. 极大值点
C. 最大值点
D. 间断点
I wonder who first _________ the idea of bags with gas to make balloons.
A. imagined
B. conceived
C. cherished
D. concealed
The train came to an abrupt stop, making us wonder where we were.
A. an uncertain
B. a slow
C. an unexpected
D. a smooth
The author's purpose in referring to Negro Slavery is to illustrate _________.
A. how frivolous our attitude is toward this very serious social problem
B. that there will always be slavery
C. the foreign origin of Negro Slavery
D. that the worst slave-driver of all is the slave-driver who drives himself
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