Given a context passage, generate a question from the passage such that its answer is shortest continous span from the passage.

Input: Consider Input: Oil is a liquid fossil fuel that is extremely useful because it can be transported easily and can be used in cars and other vehicles. Oil is currently the single largest source of energy in the world. Oil from the ground is called crude oil, which is a mixture of many different hydrocarbons. Crude oil is a thick dark brown or black liquid hydrocarbon. Oil also forms from buried dead organisms, but these are tiny organisms that live on the sea surface and then sink to the seafloor when they die. The dead organisms are kept away from oxygen by layers of other dead creatures and sediments. As the layers pile up, heat and pressure increase. Over millions of years, the dead organisms turn into liquid oil. In order to be collected, the oil must be located between a porous rock layer and an impermeable layer (Figure 1.1). Trapped above the porous rock layer and beneath the impermeable layer, the oil will remain between these layers until it is extracted from the rock. Oil (red) is found in the porous rock layer (yellow) and trapped by the impermeable layer (brown). The folded structure has allowed the oil to pool so a well can be drilled into the reservoir. To separate the different types of hydrocarbons in crude oil for different uses, the crude oil must be refined in refineries like the one shown in Figure 1.2. Refining is possible because each hydrocarbon in crude oil boils at a different temperature. When the oil is boiled in the refinery, separate equipment collects the different compounds. Most of the compounds that come out of the refining process are fuels, such as gasoline, diesel, and heating oil. Because these fuels are rich sources of energy and can be easily transported, oil provides about 90% of the energy used for transportation around the world. The rest of the compounds from crude oil are used for waxes, plastics, fertilizers, and other products. Gasoline is in a convenient form for use in cars and other transportation vehicles. In a car engine, the burned gasoline mostly turns into carbon dioxide and water vapor. The fuel releases most of its energy as heat, which causes the gases to expand. This creates enough force to move the pistons inside the engine and to power the car. Refineries like this one separate crude oil into many useful fuels and other chemi- cals. Click image to the left or use the URL below. URL: The United States does produce oil, but the amount produced is only about one-quarter as much as the nation uses. The United States has only about 1.5% of the worlds proven oil reserves, so most of the oil used by Americans must be imported from other nations. The main oil-producing regions in the United States are the Gulf of Mexico, Texas, Alaska, and California (Figure As in every type of mining, mining for oil has environmental consequences. Oil rigs are unsightly (Figure 1.4), and spills are too common (Figure 1.5). Click image to the left or use the URL below. URL: Offshore well locations in the Gulf of Mex- ico. Note that some wells are located in very deep water. Drill rigs at the San Ardo Oil Field in Monterey, California.

Output: crude oil is a mixture of many different


Input: Consider Input: The 1980 film Magnificent 72 and the 2011 film 72 Heroes focus on the uprising. Events of the uprising open the 2011 film 1911.

Output: Which film cam out first, in 1980 Magnificent 72 or 2011 72 Heroes?


Input: Consider Input: The Internet can be a great way to connect with people. The latest web craze is social networking on websites such as MySpace. More than 65 million young people use online social networking sites. That cyberspace trend is causing problems in school, however. In a recent survey, nearly 36 percent of school administrators said that social networking sites troubled learning in their districts. Should school districts ban sites like MySpace? Teachers are worried that some students use social networking to post personal information and to cyber bully other students. One of the biggest dangers comes from people who find out kid's personal information. Many districts have blocked students from accessing or using social networking sites from school computers, and some have suspended students for posting harmful material on those sites from their home computers. Nearly two-thirds of US kids have computers in their homes, according to the US Census Bureau. "It is important to keep in mind that just blocking access to social web sites at school is not the end of the story," warns NSBA executive director Anne Bryant, "Most of the misuse of these sites takes place at home but still affects the classroom." _ . They say the main problem with sites like MySpace is that students don't understand the dangers involved in using them. "Many students are posting personal information about themselves without regard to who has access to that information," Jim Hirsch said, "Schools should focus on educating their students and their parents on how to be safe online." Experts argue that too many schools are forbidding students to use social networking web sites without thinking about their educational benefits. "Social networking web sites can help connect students in the United States to their peers in other countries, providing invaluable lessons in foreign cultures," explains Hirsch.


Output: Where do students usually misuse social networking sites?