Cars are currently the major source of air (__)(pollute).
举一反三
- With internal combustion engines, future cars will pollute the air to a much less extent.
- The air in this area got A: to pollute B: pollute C: polluting D: polluted
- One benefit the author mentions is that the system______. A: uses no electricity B: has a fire-safety shutoff C: does not pollute the air in the house D: pollute the air in house
- There is a lot of (pollute) ________in the air, because a chemical factory is near here.
- _________(pollute) air and water will do harm to people's health.