Read the text and then choose the best answer A, B, C or D.
Tsunamis, whose name derives from the Japanese expression for high wave in a harbor, are giant sea wave. These waves are quite different from storm surges. They are also referred to by the general public as tidal waves although they have nothing to do with tides. Scientists often refer to them as seismic sea waves, which is far more appropriate because they are often the result of undersea seismic activity.
Tsunamis can be caused when...
Đọc tiếp
Read the text and then choose the best answer A, B, C or D.
Tsunamis, whose name derives from the Japanese expression for "high wave in a harbor", are giant sea wave. These waves are quite different from storm surges. They are also referred to by the general public as tidal waves although they have nothing to do with tides. Scientists often refer to them as seismic sea waves, which is far more appropriate because they are often the result of undersea seismic activity.
Tsunamis can be caused when the sea floor suddenly moves, during an underwater earthquake or volcano, and the water above the moving earth is suddenly displaced. This sudden shift of water sets off a series of waves. These waves can travel great distances, at speeds close to 700 kilometres per hour. In the open ocean, tsunami waves are not very high, often no more than one or two metres. It is when they hit the shallow waters near the coast thay they increase in height, possibly up to 40 metres.
1. The passage mainly discusses __________
A. tidal waves B. tides C. tsunamis D. storm surges
2. All of the following is true about tidal waves EXCEPT __________
A. They are as another name for tsunamis
B. They are caused by sudden changes in high and low tides
C. this term is not used by the scientists
D. the name refer to the same phenomenon as seismic sea waves
3. The word "them" in the passage refers to __________
A. tidal waves B. tsunamis C. storm surges D. sea waves
4. The word "shallow" in the passage mostly means __________
A. not clear B. tidal C. coastal D. not deep
5. It can be understood from the passage that tsunamis __________
A. cause severe damage in the middle of the ocean
B. generally reach heights greater than 40 metres
C. are far more dangerous on the coast than in the open ocean
D. are often identified by ships on the ocean
