Such problems（）air pollution and traffic jams becoming more and more serious in some big cities.
A: like
B: about
C: as
D: of
A: like
B: about
C: as
D: of
举一反三
- Now the pollution caused by increasing number of cars ___________ more and more serious in many cities. A: ecome B: ecame C: is becoming D: had become
- Public opinion was becoming more ______ on environmental pollution problems; more and more people were discussing and arguing about them.
- Generally speaking, the air pollution in cities is more serious than ______ in the country. A: ones B: one C: that D: those
- Public opinion was becoming more ________ on environmental pollution problems; more and more people were discussing and arguing about them. A: concentration B: concentrated
- I don’t like to live in the big cities, for there is too much<br/>air ____. A: traffic B: pollution C: transportation D: sightseeing