顿咳
参考答案：
解析：是小儿时期感受时行邪毒引起的肺系时行疾病，临床以阵发性痉挛咳嗽，咳后有特殊的鸡啼样吸气性吼声为特征。
质量为4千克的水，温度升高了50℃。求：水吸收的热量Q吸。[c水=4.2×103 焦/（千克· ℃）]
How often have you queued for ______ seems like hours at the booking office before you can get a train ticket
A．what
B．which
C．that
D．when
