(travel)（）by train is much cheaper than by air.
举一反三
- Travelling by train is much cheaper and far more ______________ than a trip by air. (enjoy)
- What can we learn from the speech A: Ground travel can sometimes offer more service than air travel. B: Ground travel can offer as much services as air travel. C: Air travel offers more and better services than ground travel.
- I usually go back home by bus. It's much （）than going by train A: cheap B: cheaper C: cheapest
- 词汇与结构 Warm air is less dense than cool air, and _____ air is less dense than dry air.
- The pressure of pilot air is usually （） than that of starting air.