( )不是作为单独的控件来显示表或查询中的“是”或“否”的值。
A．复选框
B．列表框
C．切换按钮
D．选项按钮
参考答案：B
It is required that under no circumstances ______ betray ourselves even if there are temptations
like money or beauty. [ ]
A. we will
B. should we
C. we
D. we shall
痰中含有许多细菌、尘粒等有害物质，要随时随地排出体外。 （ ）
