选定段落的方法( )
A．在段落中三击
B．在段落中双击
C．在段落中按CTRL单击
D．在段落中按ALT单击
参考答案：A
一次函数y=kx+b满足x=地时，y=-h；x=h时，y=h，则这个一次函数是（ ）
A．y=2x+1
B．y=-2x+1
C．y=2x-1
D．y=-2x-1
--- He didn’t come to school yesterday, didn’t he ?
--- _________.He was ill in bed.
A．Yes, he did
B．No, he didn’t
C．Yes, what a pity
D．No, I think
