18. According to the professor, why are tornadoes able to destroy houses so easily?
18. According to the professor, why are tornadoes able to destroy houses so easily?
The two countries signed an agreement to reduce their nuclear______. A: tornadoes B: armories C: hectares D: heretics
The two countries signed an agreement to reduce their nuclear______. A: tornadoes B: armories C: hectares D: heretics
The two countries signed an agreement to reduce their nuclear ______. A: tornadoes B: B. armories C: C. hectares D: D. heretics
The two countries signed an agreement to reduce their nuclear ______. A: tornadoes B: B. armories C: C. hectares D: D. heretics
Why do tornadoes appear to be dark A: They occur only at night. B: They are funnel-shaped. C: They pick up debris from the ground. D: They are water-laden.
Why do tornadoes appear to be dark A: They occur only at night. B: They are funnel-shaped. C: They pick up debris from the ground. D: They are water-laden.
中国大学MOOC: 下面这个“龙卷风”（Tornadoes）的仿真图片源自以下哪份报告的封面（ ）【图片】【图片】
中国大学MOOC: 下面这个“龙卷风”（Tornadoes）的仿真图片源自以下哪份报告的封面（ ）【图片】【图片】
The author mentioned the tornado in Edmonton, Canada in order to ______. A: explain different types of weather B: show that tornadoes occur frequently in Canada C: indicate the tornado are common in summer D: give an example of a damaging storm
The author mentioned the tornado in Edmonton, Canada in order to ______. A: explain different types of weather B: show that tornadoes occur frequently in Canada C: indicate the tornado are common in summer D: give an example of a damaging storm
中国大学MOOC: 下面这个“龙卷风”（Tornadoes）的仿真图片源自以下哪份报告的封面（ ）http://edu-image.nosdn.127.net/382239FD3C5DF621B9894534F650B553.jpg?imageView&thumbnail=890x0&quality=100http://edu-image.nosdn.127.net/EF4DDB682B35755607191C6DE917887F.jpg?imageView&thumbnail=890x0&quality=100
中国大学MOOC: 下面这个“龙卷风”（Tornadoes）的仿真图片源自以下哪份报告的封面（ ）http://edu-image.nosdn.127.net/382239FD3C5DF621B9894534F650B553.jpg?imageView&thumbnail=890x0&quality=100http://edu-image.nosdn.127.net/EF4DDB682B35755607191C6DE917887F.jpg?imageView&thumbnail=890x0&quality=100
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.
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.