Q: Write a multi-choice question for the following article, with the given choices and answer: Article: It was a freezing cold winter day. My father and I went to the market to buy a few oranges. When we arrived, the market was crowded with people. We looked around and stopped at the sight of a small booth . It was just a big piece of cloth on the ground with a few fresh-looking oranges. A young girl was sitting on the ground, reading next to the booth. My father cleared his throat and asked,'How much are the oranges?' The girl jumped up and asked,'Oh....what?' 'How much are the oranges?' my father repeated patiently. 'Oh......two for one yuan ,'the girl answered politely. 'They are not fully grown......a bit sour ,' she added ,when my father was examining the oranges. After a while he said, 'I don 't mind if they are sour......I'll buy thirty of them.' I looked at him, baffled . Then the girl put the oranges in a bag and gave it to him. My father paid for the oranges and we left. 'Why did you buy so many oranges?' I asked my father, 'Well, she was so truthful and even told me that her oranges are sour; besides, she really enjoys studying. And look at her book-it's so old; maybe she can use the money she earned to buy a book!' I nodded my head. Just then, I felt somebody pulling my arm; I turned and recognized it was the girl from whom we bought the oranges.' Here's......here's ......your change ......' she panted , and put the money in my hand. Before we could say something ,she had already turned a corner and was out of sight. The girl and her oranges will be in my memory forever. Options: A He liked to eat sour oranges. B He wanted to help the young girl. C He thought the oranges were cheap. D He thought the oranges were fresh. Answer: B He wanted to help the young girl. Question:
A: Why did the author's father buy so many oranges?

Q: Write a multi-choice question for the following article, with the given choices and answer: Article: The evolution of the first animals may have oxygenated Earth's oceans. New research led by the University of Exeter challenges the long held belief that oxygenation of the atmosphere and oceans was a precondition for the evolution of complex life forms. The study, published in the journal Nature Geoscience, builds on the recent work of scientists in Denmark who found that sponges the first animals to evolverequire only small amounts of oxygen. Professor Tim Lenton of the University of Exeter, who led the new study, said: "We argue that the evolution of the first animals could have played a key role in the widespread oxygenation of the deep oceans. This in turn may have the evolution of more complex, mobile animals." Critical to determining oxygen levels in the deep ocean is the balance of oxygen supply and demand. Demand for oxygen is created by the sinking of dead organic material into the deep ocean. The new study argues that the first animals reduced this supply of organic matterboth directly and indirectly. Sponges feed by pumping water through their bodies, "digesting" the tiny particles of organic matter, and thus helping oxygenate the shelf seas that they live in. By oxygenating more of the bottom waters, the first animals actually increased the removal of the essential nutrient phosphorus in the ocean. This in turn reduced the productivity of the whole ocean ecosystem, lowering oxygen demand and thus oxygenating the deep ocean. A more oxygen-rich ocean created ideal conditions for more complex mobile animals to evolve, because they have a higher requirement for oxygen. These included the first predatory animals with guts that started to eat one another, marking the beginning of the type of food webs we are familiar with today. Professor Simon Poulton of the University of Leeds, who is a co-author of the study, added: "This study provides a possible mechanism for ocean oxygenation without the requirement for a rise in atmospheric oxygen. It therefore questions whether the long-standing belief that... Options: A present the view that the first animals played an active role in oxygenating oceans B introduce two opposite opinions on how the first animals oxygenated oceans C analyze how atmospheric oxygen stepped up the evolution of oceanic animals D explain how oceanic oxygen determines the amount of atmospheric oxygen Answer: A present the view that the first animals played an active role in oxygenating oceans Question:
A: The main purpose of the passage is to _ .

Q: Write a multi-choice question for the following article, with the given choices and answer: Article: Hacking our senses to boost learning power Some schools are pumping music, noises and pleasant smells into the classroom to see if it improves exam results. Could it work? Why do songs stick in our heads? What does your school smell like? Is it noisy or peaceful? It might not seem important, but a growing body of research suggests that smells and sounds can have an impact on learning, performance and creativity. Indeed, some head teachers have recently taken to broadcasting noises and pumping smells into their schools to see whether it can boost grades. Is there anything in it? And if so, what are the implications for the way we work and study? There is certainly some well-established research to suggest that some noises can have a harmful effect on learning. Numerous studies over the past 15 years have found that children attending schools under the flight paths of large airports fall behind in their exam results. Bridget Shield, a professor of acoustics at London South Bank University, and Julie Dockrell, from the Institute of Education, have been conducting studies on the effects of all sorts of noises, such as traffic and sirens , as well as noise generated by the children themselves. When they recreated those particular sounds in an experimental setting while children completed various learning tasks, they found a significant negative effect on exam scores. "Everything points to a bad impact of the noise on children's performance, in numeracy, in literacy, and in spelling," says Shield. The noise seemed to have an especially harmful effect on children with special needs. Whether background sounds are beneficial or not seems to depend on what kind of noise it is -- and the volume. In a series of studies published last year, Ravi Mehta from the College of Business at Illinois and his colleagues tested people's creativity while exposed to a soundtrack made up of background noises -- such as coffee-shop chatter and construction-site drilling -- at different volumes. They found that people were more... Options: A students' creativity improves in a quiet environment B we may play some Mozart music while students are learning C a proper volume of background noises does improve creativity D noise of coffee-shop chatter is better than that of construction-site drilling Answer: C a proper volume of background noises does improve creativity Question:
A:
Ravi Mehta's experiment indicates that _ .