一氧化碳中毒时，出现头晕、头疼、恶心、呕吐、心慌、周身无力等症状属（）。
A.轻度中毒
B.中度中毒
C.重度中毒
参考答案：A
—Picasso, could you please spare me a few minutes? I have something of vital importance to tell you.
— ______，but I hope "a few minutes" won’t turn into a few hours.
A．It doesn’t matter
B．That’s kind of you
C．I’m afraid not
D．I guess so
目前，云梯消防车的最大作业高度一般为（）米。
A.20～60
B.20～80
C.20～100
D.20～40
