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
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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
What does the student usually have to do before taking the advanced sketching course
A. Write a book.
B. Attend an afternoon meeting.
C. Enroll in another class.
D. Go to the art museum.
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