Calls for Tsunami Alert System?
A tsunami is a series of huge waves caused by an undersea disturbance(干擾),such as an earthquake or volcano. The waves travel in all directions, like the ripples(波紋)caused by throwing a rock into a lake. Last year’s tsunami has made people realize the importance of tsunami early warning systems. The US National Oceanic and Atmospheric Administration has a system of buoys (that are called the Tsunami Real-Time Reporting System).There are six of these ?tsunami? detection systems placed around Pacific coastlines. The BPR recorders are used to detect slight changes in the overlying water pressure. They can detect wave as small as a centimeter above the sea level. This information is sent to a satellite via the buoy. The satellite then sends the data to the two warning centers in Alaska and Hawaii.?
1. A tsunami is not caused by _______.?
A. undersea disturbance B. an earthquake?
C. throwing a rock into a lake D. a volcano?
2. Which of the following detects tsunami?
A. Bottom pressure recorder. B. Buoy.?
C. Satellite. D. Ground warning centre.?
3. This passage is mainly about _______.?
A. a kind of equipment to detect tsunami? B. the danger of the tsunami?
C. the cause of the tsunami? D. the time of the tsunami?
4. It seems that ?_______.?
A. people didn’t realize the importance of tsunami warning system before last year?[來
B. people have already built tsunami warning systems?
C. there won’t be any tsunami any more?
D. tsunami warning system has proved not so efficient?
5. The underlined word “via” most probably means “_______”.?
A. from B. through C. in D. on??