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: This is a dangerous world we live in.The number of murders goes up every year, people are dying of cancer, more people contract HIV, more teens are using drugs, etc.You know this because you have heard all the statistics on the news and in the paper. But do you really have an accurate idea what they mean? The numbers are growing up, but how do they compare to the growth in population? Are more cases of these diseases being reported because of better testing techniques, or are the diseases more common? The fact is that without knowing the background statistics mean very little. This growing trend of reporting only part of the information is becoming dangerous.For example, several years ago a high school student reported the dangers of the chemical known as dihydrogen monoxide.This chemical, found in most cancerous tumors , is often found in the blood of people drunk on alcohol, and causes complete physical and mental dependence for those who take the chemical even once.After reading his report, more than 75% of his Advanced Placement Chemistry class voted to forbid this dangerous chemical! Every one of the above statements is true, yet this chemical is necessary to all life on earth.The students made the mistake because they voted knowing only a few statements and statistics, rather than the chemical's full background. The point of this article is that one should be aware of what is and is not being said.When one finds a new fact or number, one should try to consider other important information before forming an opinion with only half-truths.Always remember that the author is trying to convince you of his or her own view, and will leave out information that is different to his view.For example, look again at the statistics that suggest skiing is safe.Only 32 people may die each year when skiing, while 897 die from lightning strikes, but which is really the most dangerous? If you think about it, you realize far fewer people go skiing each year than the number of people who are in danger of a lightning strike.When you think about it, skiing is more dangerous than you might at first think when looking at statistics.If we teenagers are to be left in this world, we had better be able to think critically, and form our own views, rather than be easily persuaded by another's.To be warned is to be prepared.
Answer: readers are not able to analyze so much information at once.
[A]: Relative information is often left out because _ .

[Q]: Article: Let's pretend we're sailing down the Rhine River on a pleasure boat. The Rhine is one of the main waterways of Germany, and the river traffic is heavy. It's interesting to watch the many boats going up and down the river. But the river traffic is not nearly so interesting as the beautiful scenery along the banks and hillsides. The boat is passing many old castles. We can see people working in the vineyards on the hillsides. There are vineyards as far as the eye can see. Wine from the Rhine Valley is famous all over the world. Suddenly our boat slows down and begins to turn a little. We are coming to a sharp bend in the river. On our right we can see a rocky cliff over 400 feet high. At first it looks quite ordinary, but there is nothing ordinary about it. There are many stories, poems, and songs about the cliff. We are looking at the Lorelei. Then someone on the boat begins to sing in German, the song of the Lorelei. It is a song about a beautiful siren who has lured many sailors to their deaths. The siren is supposed to sit on the rock combing her long golden hair and singing. The sailors who hear her forget to steer , and the current of river hurls their boats on the rocks and dashes them to pieces. Soon other people on the boat begin to sing. The beautiful song adds to special magic to the moment, and you begin to realize why so many people have made this trip down the Rhine to see the rock of the Lorelei.
Answer: to see the beautiful scene along the banks and hillsides
[A]: The most interesting thing to those who are sailing down the Rhine River on a pleasure boat is _ .

[Q]: Article: If you go to Ethiopia,you'll find a strange palm-like structure,which is called Warka Water.It gathers water from fog and condensation and is invented by an Italian firm. When Italian designer Arturo Vittori and Swiss architect Andreas Vogler first visited Ethiopia in 2012,they were shocked to see women and children forced to walk miles to access what,for them,had always been within easy reach,water. Only 34 percent of Ethiopians have access to a reliable water supply.Some travel for up to six hours a day to fetch some or,even worse,have to use pond water polluted by human waste, _ the spread of disease. Worldwide,about 768 million people--two and a half times the U.S.population--don't have access to safe drinking water.So just imagine if we could just pull water out of thin air?That's what Vittori and Vogler asked once they saw the severe problem and promised to take action.Their firm,Architecture and Vision,has since come up with Warka Water,a grand palm-like structure that may look like something you'd see in a modern art museum,but it's been designed to harvest water from the air. Warka Water,which is named after an Ethiopian fig tree,is composed of a 30-foot bamboo frame containing a fog-harvesting nylon net that can catch water easily,can be easily lowered for repairs and allow communities to measure the water level.Collecting water through condensation is hardly a new technique,but the creators of Warka Water say their tree-inspired design is more effective,maximizing surface and perfecting every angle to produce up to 26 gallons of drinkable water a day--enough for a family of seven. Western organizations have been working to provide clean water access in Africa for decades,so Warka Water joins a very long list of earlier attempts.So far,high-tech solutions,like the once promising Playpump,have failed,mostly due to high costs and maintenance issues. This is where Warka Water stands apart--a lower-tech solution that is easy to repair and far more affordable than digging wells in the rocky Ethiopian plateau.
Answer: gather clean water efficiently
[A]:
Warka Water is designed mainly to _ .