instruction:
In this task, you're given an article and an answer. Your task is to generate the question for the answer based on the given article.
question:
Article: THE first night in Yosemite had been awful. I hadn't been able to sleep and I was stuck in a too small tent with my wife and two kids. "Things haven't worked out," I said to myself. But, like so many other things I complain before my morning coffee, this one was ridiculously off-key. Things weren't bad; they were good. A hundred yards(91 meters) away was Summit Lake, with its wonderful early morning mists shimmering off the water. A couple of miles to the southwest was the base of the Lassen Peak Trail. The base was 8,000 feet (2,400 meters) above sea level, huge snow banks dotting the place even in mid August. It was beautiful. We fired up the camp stove, got out our cold boxes from the heavy metal locker ,fired up some bacon, cut open some bread, and boiled up a cup of coffee. Half an hour later, my 6-year-old daughter and I were in the parking lot of the Lassen Peak Trail, getting ready to hike. We wouldn't make it all the way-- young legs get pretty tired on a steep mountain path, but it didn't matter. We would see great views spread out below us, the volcanic ash that layered on the earth turning the melting snow a mysterious pink as the sun struck it. Later, on the hike, I felt stupid about my morning complaints. Everything had been worthwhile. It gave me enormous satisfaction to see my daughter so excited about the view from the mountain. Yes, camping is uncomfortable. But there's also something wonderful about being so close to nature. Just as importantly, there's something about getting young children out of their increasingly technology-filled comfort zones and forcing them to encounter the non-cyber world around them. We lose something when we spend all our time cocooned inside a carefully constructed modernity, when read about daily affronts to the environment, yet don't fully realize what is at risk, removed as we are from nature. It's a good thing to reconnect every so often with the Great Outdoors. By Sasha Abramsky
Answer: Uncomfortable.
answer:
How did the author first feel about camping in Yosemite?

question:
Article: What if we could replace oil with a fuel which produced no pollution and which everybody had equal access to? The good news is that we can. In fact, we are swimming in it--- literally. Hydrogen is one of the building blocks of the universe. Our own sun is basically a big, dense cloud of the stuff. And hydrogen can be used to create electricity for power, heat and light. The problem is that hydrogen is everywhere and nowhere at the same time. It does not exist as a material on its own, but is always part of something else. So it has to be separated before it can be used. Most commercial hydrogen in use now is created from natural gas. As oil will start to run out in around the year 2030, it makes sense to produce as much hydrogen as possible as soon as we can. But natural gas supplies will also begin to run out soon after. Another source is needed. Researchers are now using electricity to make water into hydrogen. Companies are working on the problem in their own areas. The first commercial hydrogen "fuel cells" for computers and mobile phones have already come on to the market. Auto companies have also invested over US $2 billion in the production of hydrogen fuelled cars. The nations of a hydrogen fuelled planet would not fight over energy recourses. There would be a great reduction in pollution. The only by-product of creating hydrogen is pure drinking water--- something that is very scarce in many parts of the world. But that is not where the good news ends. Once the costs of producing hydrogen have been brought down, it will possibly provide power for a third of the Earth's population that has no electricity. And electricity creates wealth. In South Africa over the last decade there has been a large programme of electrification. Thanks to the programme, people do not have to spend their days looking firewood to burn for heat. And with electric light, they can work long into the night. Some scientists see radical changes in the way the human race co-operates. Hydrogen creates electricity, and is also created by _ . With dual use fuel cells, everyone who consumes energy could also produce it. Late at night, a man drives home in London and connects his car into the "world-wide hydrogen web," which it supplies with electricity. A few hours later, a man in Beijing uses that electricity to power the hydrogen cell in his car. Hydrogen could be the first democratic energy source. Like all dreams of the future, it seems very far away. But the threat of war and terrorism in the Middle East has made governments and businesses more aware of the need to end oil dependency and spend more time and money on hydrogen resource. So maybe the threat of war is not a completely bad thing for the future of the human race.
Answer: It has to be separated from other materials.
answer:
What is the problem with using hydrogen as energy?

question:
Article: A graded reader is a book containing simplified languages used to help learners master the language. Readers come in different levels, from beginners to advanced. English learners need to choose a reader that is suitable for their level. Why use readers? Lots of research shows that extensive reading improves all aspects of language learning, including vocabulary, speaking skills, fluency ,writing skills and reading comprehension. prefix = st1 /Reading is a way of learning English without classes or a teacher. It helps develop learner independence. And while reading graded readers, learners don't have to run to a dictionary because the language is at their level. How do I get started? The entire class can read the same book or different books at different times. How do I know the right level? If your class is all reading the same book, choose one that is appropriate for their level. If your students are reading different books, you can have a selection of books at different levels. In this case, don't worry too much about the level. A learner who is interested in detective stories might read a higher level book if the motivation is there. How to read the book depends on students' age, motivation and class time available. Some classes like to read silently, others like to read aloud in small groups and some enjoy being read to by the teacher. Be sensitive to the class and ask for their opinions. Some pre-reading activities are needed. Before students open a book, it is important to spark interest in the story and in the whole process of reading. For example, ask them to guess what the story is from cover, chapter titles and let students put them in the best order, or discuss the author. During reading, choose a suitable chapter or chapters that can be broken down to make a comic strip . Or students select a part of the book to make into a radio play. Students can also become journalists and report on parts of the story. Choose a piece of action and have students write it up. Besides, students can role-play an interview with a character.
Answer: Pupils.
answer:
Who do you think the passage is written mainly for?