Unfortunately belts are worn only by ________ percent of drivers and passengers in cities.
举一反三
- Passengers must fasten their seat belts during take-off or landing.
- Special care must be taken in checking the seat belts of certain types of passengers, especially the elderly, handicapped passengers and others.
- How many cities<br/>will have air quality monitoring systems installed by the end of this<br/>year?() A: 42 cities. B: 220 cities. C: 150 cities. D: 262 cities.
- Many Americans want to have their homes outside the cities and their jobs in the cities.
- Many drivers think that most passengers are very pleasant, although occasionally they can be .