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.
One example is below.
Q: 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
A: Researchers did experiments on kids in order to find out _ .
Rationale: It is clearly mentioned in the article that to the check effect of mood on children is the main purpose of the experiment.
Q: Article: The Beijing Hutong (old lane) areas have a very special and important position in the rich history and culture of Beijing. While visiting the Beijing Hutong, you can appreciate the dramatic changes that the rest of Beijing has undergone. You can see evidence of the history of Beijing, experience the old way of life and experience traditional Beijing culture.   The Beijing Hutong is made up of lanes or alleys formed by lines of pre-modern quadrangles (siheyuan), four-sided dwelling compounds or quadrangles consist of one-story courtyard houses, which make up old Beijing, and feature typical Chinese residential architecture.   Beijing road classification was once s follow: A 36-foot-wide road was called a standard, street, an 18-foot-wide one was a small street and a 9-foot-wide lane was named a hutong. In fact, the Beijing Hutongs are unclassifiable by the traditional standard, ranging from 40 centimeters to 10 feet in width. The longest hutong has more than 20 turns. It is easy to get lost in the maze of winding lanes hat is the hutong, with the gray-tiled houses and deep alleys crossing each other, all identical in appearance, with many blind hutongs or culdesacs.   Hutongs were first named as such in the Yuan Dynasty(1271-1368), with its Mongolian rulers having an influence on the Chinese language. However, siheyuan or quadrangles have probably been around much longer. The name of a hutong represents its origin, location or history. It is in the gray-tiled deep lanes that families play, travel, buy goods, gossip and connect. In beijingers'eyes, hutong means a period of history, a cordial lifestyle and even an "encyclopedia of Beijing". When urban construction threatens the existence of these hutongs, Beijingers become worried. Beijing still has about 400 000 residential quadrangles now, mainly distribute over the East, West, Xuanwu and Chongwen districts. The municipal government has marked a number of these compounds for protection.   If you would like to have a glimpse into Beijing' Yesterday, you are highly recommended to have a short adventure trip to the Hutongs. Beijing Hutong Tour (Rickshaw Hutong, Bike Hutong and Walk Hutong) is organized by Beijing Xinhua International Tours. 
 Answer: the width of all the hutongs is 9 feet
A:
The characteristics of Beijing Hutongs are the following except   _  .