“边界”命令可以将选区的边界向（）扩展，扩展后的边界与原来的边界组成一个新的环状选区。
A. 任意角度
B. 上边或下边
C. 内部或外部
D. 颜色相似区域
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在执行“平滑”命令时，可通过调整（）的数值来设置选区的平滑范围。
A. 扩展量
B. 取样半径
C. 宽度
D. 羽化半径
利用“填充”命令可在选区内部填充（）
A. 前景色
B. 背景色
C. 颜色或图案
D. 以上答案均可
Both students and their parents wrote to the writer to seek advice about _______ .
A. how to choose courses at college
B. how to take advantage of school libraries
C. how to get good scores in high school or at college
D. how to get a good education
We learn from the text that there is little chance of success in the computer industry for people who______.
A. drop out of college
B. have no high school diplomas
C. fail to seize opportunitie
D. work as part time programmers
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