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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.
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Article: As civilization proceeds in the direction of technology, it passes the point of supplying all the basic essentials of life--food, shelter, clothes and warmth. Then we are faced with a choice between using technology to provide and fulfill needs which have now been regarded as unnecessary or, on the other hand, using technology to reduce the number of hours of work which a man must do in order to earn a given standard of living. In other words, we either raise our standard of living above that necessary for comfort and happiness or we leave it at this level and work shorter hours. I shall take it for granted that mankind has, by that time, chosen the latter alternative. Men will be working shorter and shorter hours in their paid employment. It follows that the housewife will also expect to be able to have more leisure in her life without lowering her standard of living. It also follows that human domestic servants will have completely ceased to exist. Yet the great majority of the housewives will wish to be relieved completely from the routine operations of the home such as scrubbing the floors or the bath of the cooker, or washing the clothes or washing up, or dusting or sweeping, or making beds. By far the most logical step to relieve the housewife of routine is to provide a robot which can be trained to the requirements of a particular home and can be programmed to carry out half a dozen or more standard operations, when switched by the housewife.
Answer: it is not necessary to supply the basic essentials of life
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As civilization develops in the direction of technology, _ .

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Article: At night, bats fly through the air, catching hundreds of insects and other small animals. But during the day, they hardly move at all. Instead, bats pass the time hanging upside down from a secret spot. There are a couple of reasons why bats rest this way. First of all, it puts them in a position for takeoff. Unlike birds, bats can't fly into the air from the ground. Their wings don't produce enough lift to take off from a dead stop, and their hind legs are so small and underdeveloped that they can't run to build up the necessary takeoff speed. Instead, they use their front claws to climb to a high spot, and then fall into flight. During the hours when most enemies are active, bats gather where few animals would think to look and most can't reach. This allows them to disappear from the world until night comes again. There's also little competition for these resting spots, as other flying animals don't have the ability to hang upside down. Bats have a unique physiological adaptation that lets them hang around this way without using any energy. For you to hold your fist around an object tight, you contract several muscles in your arm, which are connected to your fingers by tendons ;as one muscle contracts, it pulls a tendon, which pulls one of your fingers closed. A bat's talons close in the same way, except that their tendons are connected only to the upper body, not to a muscle. To hang upside down, a bat pulls its claws open with other muscles. To get the talons to take hold of the surface, the bat simply lets its body relax. The weight of the upper body pulls down on the tendons connected to the talons, causing them to hold tight. Therefore, the bat doesn't have to do anything to hang upside down.
Answer: they can't start to fly from the ground directly
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Bats hang upside down because _ .

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Article: Try imagining what the world will be like in the year 3000. Some serious thinkers are starting to imagine just that. Bart: I don't know that present-day electronic chips are, but some sort of chips -- I'd guess maybe plastic. Our three-pound brain is definitely a wonder, perhaps the greatest wonder of natural biology. In this coming century, we'll be re-engineering the brain a piece at a time, first with implants and finally engineering an complete replacement. There's no question that in the distant future we'll play the music of the mind on instruments different from the current ones. So, yes, chips are our destiny . Edward: In 3000 perhaps the biggest difference from today is that there will be no more men. Females can have female children, without any need for men. In about ten years, we'll find the cocktail that women can take to have female children. There'll be no need for men at all. Greg: What is Heaven? Heaven's a place where you can create worlds at will, and the ideal Heaven is where you run the whole thing yourself. The current means of getting to Heaven involve various supernatural systems for which, at this point, there's no scientific evidence. So I think we can reduce Heaven to an engineering project which we're doing. The demand for Heaven is great--witness the desire of every human heart, from the people who built the ancient pyramids to modern society, to live beyond one's given time. Our plan is to change human consciousness from the brain to bits of information in a computer chip, or some other kind of computational medium, so that just by thinking we'll be able to create our own personal world. And I think the first stage of Heaven will be the feeling world, and beyond that I think we'd find a higher, more spiritual plane.
Answer: it may be driven by plastic chips
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According to Bart, the brain may be the greatest wonder in the future because _ .