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.
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.
举一反三
- 18. According to the professor, why are tornadoes able to destroy houses so easily?
- 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
- 6A. As soon as we walked into the house, we turned on the air conditioner.B. We walked into the house, we turned on the air conditioner.C. We walked into the house, and we turned on the air conditioner.
- 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 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