单选题
小林编写一段文件读写操作代码，文件如下图，代码段如下：
file=open('ceshi.txt','w')
file.write("python is a programming language.")
file.close( )
file=open('ceshi.txt','r')
print(file.read( ))该代码段运行后，输出的结果为？（?）
A
IA Distributed System Based on Python.
B
python is a programming language.
C
IA Distributed System Based on Python. python is a programming language.
D
程序编译错误，不会输出结果