Growing evidence indicates air within homes and other buildings can be more seriously polluted than industrialized cities.
举一反三
- The air inside .a house on office building often has more contaminants（）the heavily polluted air outside. A: than does B: as C: as some that are D: than that of
- Many Americans want to have their homes outside the cities and their jobs in the cities.
- The air inside a house or office building often has higher concentrations of contaminants ( ) heavily polluted air outside. A: like of B: more C: than do D: than does
- Generally speaking, the air pollution in cities is more serious than ______ in the country. A: ones B: one C: that D: those
- 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.