The air inside a house or office building often has higher concentrations of contaminants ____ heavily polluted outside air.
A: than does
B: more
C: as some that are
D: like of
A: than does
B: more
C: as some that are
D: like of
举一反三
- 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
- 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
- 18. According to the professor, why are tornadoes able to destroy houses so easily? A: They create differences in air pressure inside and outside the house. B: Humid air rises rapidly toward the top of the house. C: Rotating air enters the house. D: Lower air pressure inside the house causes it to collapse.
- 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
- Generally speaking, air will be heavily polluted ______ there are factories. A: what B: which C: where