The electronic cards are the favorite with Web users with their advantages of being free in charge, being environmentally, friendly and being fast in delivery.
举一反三
- ______ transport is recognized as being more environmentally friendly than road transport. A: Rail B: Road C: Parcel D: Air
- Usually speaking, what are the tones used in business letters? A: being polite B: being considerate C: being friendly D: being regretful
- Wind power are being used to generate (electronic)（）.
- The goods are being prepared for immediate delivery and will be ready for（）
- the state of being free from tension and anxiety