csv 文件中读入数据的程序段如下：
f=open("city.csv","r")
ls=[]
for line in f:
ls.append(line.strip("\n").split(","))
f.close()
print(ls)
与划线处等同功能的语句是？（ ）
line.pop("\n")
line.del("\n")
line.remove("\n")
line.replace("\n","")