苏子降气丸可用于
A．阴虚燥咳
B．痰多色白
C．痰多色黄
D．咳嗽喘促，气短胸闷，动则加剧
E．风寒咳嗽，痰湿壅盛
参考答案：B,D
按要求改写句子。
1. I like that sweater. (变为复数)
I like _____________ _____________.
2. I like those books. (改为一般疑问句)
_____________ you _____________ those books?
3. Red is my favourite colour. (对划线部分提问)
_____________ your favourite _____________?
4. She doesn't like this shirt. (变为肯定句)
She _____________ this shirt.
差分方程yt+1-4yt=20·4t满足y0=3的特解为______．
