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【单选题】When you want to go shopping and decide how much money you can spend for new clothes, think about the kind of clothes you really need. Then look for those clothes on sale. There are labels(标签) inside ...
A.
Right.
B.
Wrong.
C.
Doesn’ t say.
【单选题】关于Python函数的调用，以下描述正确的是（ ）
A.
函数在调用之前无须定义，拿来即用
B.
自定义函数在调用前必须定义
C.
内置函数在调用之前需要导入相应的库
D.
函数和调用只能发生在同一个文件中