更多"A. to track hurricanes and issue wa"的相关试题:
[填空题]
- A. to track hurricanes and issue warnings
- B. to avoid confusion
- C. to stay at home
- D. to be given to tropical storms
- E. to make predictions
- F. to kill at least 15 people
Over a million people were warned not ______.
[单项选择]
Hurricanes are violent storms that cause millions of dollars in property damage and take many lives. They can be extremely dangerous, and too often people underestimate their fury.
Hurricanes normally originate as a small area of thunderstorms over the Atlantic Ocean west of the Cape Verde Islands during August or September. For several days the area of the storm increases and the air pressure falls slowly. A center of low pressure forms, and winds begin to whirl around it. It is blown westward, increasing in size and strength.
Hurricane hunters then fly out to the storm in order to determine its size and intensity and to track its direction. They drop instruments for recording temperature, air pressure, and humidity (湿度), into the storm. They also look at the size of waves on the ocean, the clouds, and the eye of the storm. The eye is a region of relative calm and clear skies in the center of the hurricane. People often lose their lives by leaving shelter when th
A. taking out heavy things
B. moving in light-weight furniture
C. equipping the house with stones
D. covering windows
[单项选择]Hurricanes are severe cyclones with winds over seventy five miles an hour ______ originate over tropical ocean waters.
A. which
B. who
C. where
D. how to
[填空题]Hurricanes in the Atlantic are different from typhoons and cyclones in Asia.
[填空题]Most tropical storms do not become hurricanes.
[单项选择]Sunspots act like planet-sized hurricanes that suck in as much material as they spew out, temporarily overriding the laws of magnetic fields, scientists said on Tuesday.
A team of researchers from NASA and Stanford University said by peering into the Sun for the first time, they discovered how the magnetic fields, which make up the cool dark sunspots on the surface, clump together instead of dispersing. Scientists had previously observed gases pouring out of the sunspots, and thought this was the product of the various magnetic fields repelling each other, in the same way magnets repel each other when brought together. But the researchers said the out-flowing matter is just a surface feature that occurs while the sunspot sucks in new material to hold itself together.
"If you look a bit deeper, you find material rushing inward, like a planet-sized whirlpool or hurricane. This inflow pulls the magnetic fields (back) together," said Junwei Zhao, one of
A. 10
B. 10 billion
C. 10 thousand
D. 100
