In this task, you're given an article and an answer. Your task is to generate the fill-in-the-blank question for this answer based on the given article. The blanks are always at the end of the question, and can be filled with more than one word or phrase.

[Q]: Article: I had applied for the nuclear submarine program, and Admiral Rickover was interviewing me for the job. It was the first time I met Admiral Rickover, and we sat in a large room by ourselves for more than two hours, and he let me choose any subjects I wished to discuss. Very carefully, I chose those about which I knew most at the time - recent events, seamanship, music, literature, naval tactics , electronics, gunnery - and he began to ask me a lot of questions that were more difficult. Every time after my answers, he soon showed that I knew rather little about the subjects I had chosen. He always looked right into my eyes, and he never smiled. I was _ with cold sweat. Finally, he asked me a question and I thought it was my turn to show myself off. He said, "How did you stand in your class at Georgia Tech before entering Annapolis as a first year student?" I had done very well, and I threw my chest with pride and answered, "Sir, I stood thirty-ninth in a class of 820!" I sat back to wait for the congratulations - which never came. Instead, the question: "Did you do your best?" I started to say, "Yes, sir," but I remembered who this was, and thought of several of my times at the Academy when I could have learned more about our allies , our enemies, weapons strategy and so on, so I finally said, "No, Sir, I didn't always do my best." He looked at me for a long time, and then turned his chair around to end the interview. He asked one final question, which I have never been able to forget - or to answer. He said, "Why not?" I sat there for a while, shaken, and then slowly left the room.
Answer: the atmosphere of the interviews was very serious
[A]: The passage suggests that _ .

[Q]: Article: Cloud seeding is a method of artificially causing clouds to produce precipitation in the form of rain or snow.Cloud seeding has also been used in attempts to modify the severity of hail storms and hurricanes.The effectiveness of cloud seeding remains controversial .but it continues to be used in some regions to try to increase rainfall for agriculture and to build snow packs for water supplies and power production. Cloud seeding was developed by American scientists Irving Langmuir and Vincent Joseph Schaefer during and after World War II.Their work began as an effort to learn more about the buildup of ice on airplane wings, and eventually led them to attempt to create rainfall by releasing several pounds of crushed frozen carbon dioxide into a cloud from an airplane.In this form, the carbon dioxide is called dry ice.On November 13, 1946, the technique appeared to produce snow directly under the cloud; the snow then turned to rain as it fell to the ground. For their experiment, Langmuir and Schaefer selected a supercooled cloud, one in which the water droplets remain liquid in subfreezing temperatures.Their theory was that small grains of dry ice falling through the cloud would cause tiny droplets of water vapor in the cloud to freeze into crystals that attracted more water vapor.Their theory proved to be correct and eventually the crystals became heavy enough to fall from the cloud as snow.As the snow reached the warmer temperatures closer to the ground, it melted and became rain. Another scientist, Bernard Vonnegut, produced a method of cloud seeding using silver iodide .He used particles of silver iodide because its crystal structure resembled that of ice in clouds.Silver iodide also had practical advantages over frozen carbon dioxide It could be stored at room temperature and did not require an airplane as a delivery mechanism.Instead, silver iodide crystals could be fired by cannons high into the air, where wind carried them into the clouds.
Answer: it is similar
[A]: Bernard chose silver iodide as a method of cloud seeding because _ .

[Q]: Article: When the Berlin Wall came down in 1989, Leonard Bernstein gave a concert in Berlin, including Beethoven's Ode to Joy, with the word "Joy" changed to "Freedom" in the lyrics sung.The orchestra were drawn from both East and West Germany, as well as the United Kingdom, France, the Soviet Union, and the United States. Freedom was in the air and it was not just for people. The wall between East and West Germany had also kept a large population of wild pigs within the eastern forests of Brandenburg.The wall's falling down made it easier for the big pigs--a very big one can weigh over 300 pounds--to leave the woodlands and walk into the town. Warm winters and easy access to food have helped the population increase. Now about 10,000 wild pigs walk around Berlin. The nature of the beast has added to the boom ."The pigs are intelligent," says Marc Franusch, a spokesman for the Berlin forestry department. "They learn to use the neighborhoods.They get used to people, dogs, and traffic." The wild pigs tend to travel in small groups and have been found searching rubbish and gardens, feeding their piglets in the shadow of parked cars, and crossing busy roads.On average, the animals are involved in one traffic accident every day. And despite the fact that it's illegal, some Berliners have been known to give the pigs food. Though wild pigs are protected under German law, the city's forestry department is permitted to kill 2,000 of the creatures every year, targeting mostly young adult animals in forests surrounding Berlin. Pigs within city limits are only shot if they make an immediate threat.No humans have yet been seriously wounded by them, but local dogs have been the victims of their tusks. "The forestry department is not aiming to get rid of the pigs," explains Franusch, "but we do have to reduce dangerous situations."
Answer: the Berlin Wall
[A]:
The following factors contribute to the boom of wild pigs EXCEPT _ .