甘蓝在高温、高湿条件下，叶缘产生黄褐色"V"形病斑，病斑周围产生黄色晕圈，后期维管束变褐色，这是什么病害引起的？
参考答案：
黑腐病
— Have you been to the Great Wall?
—Perhaps not in my memory. ________, it might have been during my early childhood.
A．If any
B．If so
C．If ever
D．If not
卷烟只征一道消费税。
