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在国家机关、社会团体、企业事业单位和其他组织等统计调查对象中承担经常性政府统计调查任务的人员，必须取得统计从业资格，持有统计从业资格证书。 ()
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Will people ever tame the destructive, often deadly hurricane？ Either scientists or meteorologists do not yet understand the forces that generate a hurricane, but perhaps with study and time they can learn to control these enormous storms. One important study project is called Hurricane Strike. This project studies the huge Storms that do harm to thousands of people and destroy property worth millions of dollars. Scientists in this project are trying to learn more about hurricanes, especially the speed and direction of the winds. Then people living in the path of a hurricane can protect themselves and their belongings.
Dr. Robert Sheets, the chief forecaster at the National Hurricane Center in Miami, explained the importance of this information. "When we post a hurricane warning for a part of the coast," he said, "people spend about $8,000 per mile in preparation. If the hurricane does not strike land where we announced or posted warnings, then that money is wasted. But, even worse, the next time we put out a warning, the people might not pay attention to us." That is the reason for Project Hurricane Strike—to increase the accuracy of the forecast. They need to predict where the storm will be twenty-four hours later.
One hurricane, named Belle, made forecasters feel trouble. At first it appeared to be headed for Florida, so warnings were posted. However, the storm stayed at sea. Next, warnings were posted in Georgia and the Carolinas, but again it did not hit. In fact, Belle first hit the coast in New York. Millions and millions of dollars were spent on the preparation that was not needed.
Dr. Sheets said, "We received hundreds of letters. People couldn't understand how science could send people to the moon but not predict a storm's path. However, we still can't tell. The only way to find out about hurricanes is from inside them." Prediction is what Project Hurricane Strike is about, and that is part of the challenge that faces meteorologists.
The other part of the challenge is controlling hurricanes. Meteorologists work inside a hurricane by "seeding" the center "eye" with silver iodide. The silver iodide causes raindrops to form. and fall over the ocean. Taking the water out of the clouds reduces the energy of the storm. So, the rotation of the storm decreases. The wind velocity also decreases. Meteorologists can sometimes use this method to bring a dangerous hurricane under control.
Scientists have already seeded some hurricanes that were forming over the Atlantic Ocean. Some of these experiments were successful in decreasing wind speeds.
The two factors concerning hurricanes that scientists most want to learn about are ______.
Most people who travel long distances complain of jetlag (喷气飞行时差反应). Jetlag makes business travelers less productive and more prone 【21】______ making mistakes. It is actually caused by 【22】______ of your “body clock” a small cluster of brain cells that controls the timing of biological 【23】______ The body clock is designed for a 【24】______ rhythm of daylight and darkness, so that is thrown out of balance when it 【25】______ daylight and darkness at the “wrong times in a new time zone. The 【26】______ of jetlag often persist for days 【27】______ the internal body clock slowly adjusts to the new time zone. Now a new antijetlag system is 【28】______ that is based on proven 【29】______ pioneering scientific research. Dr. martin Moore-Ede has 【30】______ a practical strategy to adjust the body clock much sooner to the new time zone 【31】______ controlled exposure to bright light. The time zone shift is easy to accomplish and eliminates 【32】______ of the discomfort of jetlag.
A successful time zone shift depends on knowing the exact times to either 【33】______ or avoid brightlight. Exposure to light at the wrong time can actually make jetlag worse. The proper schedule 【34】______ light exposure depends a great deal on 【35】______ travel plans.
Data on a specific flight itinerary(施行路线) and the individual's sleep 【36】______ are used to produce a Trip Guide with 【37】______ on exactly when to be exposed to bright light.
When the Trip Guide calls 【38】______ bright light you should spend time outdoors if possible. If it is dark outside, or the weather is bad, 【39】______ you are on an aeroplane, you can use a special light device to provide the necessary light 【40】______ for a range of activities such as reading, watching TV or working.
【21】
What will the woman do？
What is the benefit of using the computer chips？
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