简述数值计算。
参考答案：
用数值计算方法借助电子计算机求出水流泥沙运动和河床演变问题的近似解，满足工程实践的需要。
写出所给单词的正确形式。
1．My____________(shoe) are under the bed.
2．— Please have a_____________(sit). — Thank you.
3．My bag is old. What about___________(you)?
4．______________(Who) sweater is this?
5．They are white. Please colour______________(they) red.
6．They are the______________(twins) books.
7．It___________(look) like a hat.
8．Excuse_________(I). Are these your coats?
9．The door is____________(lock).
10．Let us__________(look) for a pen.
I went the village yesterday_________ to see my uncle, who lived there for 20 years.
A．special
B．especially
C．specially
D．especial
