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.

Let me give you an 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
The answer to this example can be: Researchers did experiments on kids in order to find out _ .
Here is why: It is clearly mentioned in the article that to the check effect of mood on children is the main purpose of the experiment.

OK. solve this:
Article: Bamboo flooring is a growing trend in home flooring and is also a great improvement to traditional hardwood floors.It is the most environmentally friendly kind of natural flooring that you can select for your home.It is also a renewable resource,is stronger than steel,and does not suffer from problems as a result of temperature changes. Bamboo is one of the fastest growing plants on earth,and only takes five years to grow to adult form.Bamboo is harvested every five years,and starts to re-grow immediately after being harvested.For this reason,bamboo is a kind of grass,not a tree.Bamboo is hollow but very hard and can stand up to 50,000 pounds of pressure per square inch. Bamboo flooring has become very popular with its rich and beautiful golden earth colors.But it is important to shop around for a good-quality bamboo flooring product that contains no formaldehydes ,which is said to be the best kind of bamboo flooring.Many brands use cheaper bamboo that may contain formaldehydes,and this can cause indoor air pollution problems as certain chemical materials in the bamboo slowly release their pollutants into the air. So,why should we turn to bamboo to save the enviroment?In fact,bamboo cannot save the environment directly,but it is an excellent replacement product for much of the hardwood species of trees that are being harvested in rainforests.Once harvested,if these hardwood trees do grow back,it can take up to 200 years!Rainforests are the lungs of our planet and they make a significant contribution to global oxygen production. By selecting bamoo flooring,you can reduce the demand for hardwood materials and help save the environment for future generations.Of course,everyone wants to buy good-quality bamboo flooring.The brands from our shop are very high in quality and have received a lot of public praise.
Answer: it grows quickly
Answer:
Bamboo is a kind of grass because _ .