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.
Example: Article: Homework can put you in a badmood , and that might actually be a good thing. Researchers from the University of Plymouth in England doubted whether mood might affect the way kids learn. To find out the answer, they did two experiments with children. The first experiment tested 30 kids. Someshapes were hidden inside a different, larger picture. The kids had to find the small shapes while sitting in a room with either cheerful or sad music playing in the background. To test their mood, the scientists asked the kids to point to one of five faces, from happy to sad. Children who listened to cheerful music tended to point to the smiley faces while the others pointed to the unhappy ones. The researchers found that sad kids took at least a second less to find the small shapes. They also found an average of three or four more shapes. In the second experiment, 61 children watched one of two scenes from a film. One scene was happy, and the other was sad. Just like in the first experiment, kids who saw the sad scene acted better compared to the others. The researchers guessed that feeling down makes people more likely to focus on a problem or difficult situation. Not all scientists agree with them, however. Other studies argued that maybe, that cheerful music in the first experiment distracted kids from finding shapes. While scientists work on finding out the answers, it still might be wise to choose when to do your tasks according to your mood. After eating a delicious ice cream, for example, write an essay.
Answer: whether mood affects their learning ability
Example solution: Researchers did experiments on kids in order to find out _ .
Example explanation: It is clearly mentioned in the article that to the check effect of mood on children is the main purpose of the experiment.

Problem: Article: When a handheld video game runs out of power,all you have to do is plug it in and charge it up.Within a few years,some of you might do the same thing with mom's car.Automobile companies are developing vehicles that will plugin to electric sockets ,just like many laptops,digital cameras,cellphones and small video game players do.Called "plugin hybrids ",these cars will get most of their power from electricity.Their drivers will rarely have to stop at gas stations. The technology is more than just cool.In our automobilefilled world,plugin vehicles could reduce the amount of gasoline we use.That gas is made from crude oil ,which keeps rising in cost.Plus,driving around in these hybrids may even help the environment.Gasburning cars produce a lot of carbon dioxide,a type of greenhouse gas.These gases stay in the atmosphere,where they trap heat and cause global warming. The first companyproduced plugin hybrids could hit the roads by 2010.But engineers still have a lot of work to do to make the technology practical and inexpensive. Batteries are the biggest challenge.In the pluginhybrid world,lithiumion (Liion) batteries are getting the most attention.These batteries can store a large amount of energy in a small package,and they last a ly long time between charges.Liion batteries are standard in laptops,cellphones,heart devices and other similar portable devices. But because cars are so big and heavy,it would still require a suitcasesized Liion battery to power about 12km of driving.What's more,the batteries are extremely expensive. "A car filled with batteries could go a long distance," says Ted Bohn,an electrical engineer in Chicago."But it couldn't haul any people,and it would cost $100,000." So researchers need to figure out how to make batteries smaller and cheaper,among other questions. "The answers don't exist yet," Bohn says."As a kid I thought someone someplace knows the answer to everything.All of these questions haven't been decided.That's what engineering is about--making a guess,running tests and finetuning results."
Answer: the appearance
Solution: The passage mainly talks about _ of a new car.