电子图书最通用的存储格式是()。
A、PDF
B、PDG
C、NLC
D、WDL
参考答案:A
按要求完成句子
1. 我从未读过这么好的书.
I _____ _____ _____ such a good book.
2. I have fed the cat already.(改为一般疑问句)
_____ you _____ the cat _____?
3. He has cleaned out the refrigerator already(改为否定句)
He _____ _____ _____ the refrigerator yet.
4.We have been friends for 3 years.(对划线部分提问)
_____ _____ _____ you _____ friends?
国际贸易术语