Homework can put you in a bad mood (心情), 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. Some shapes (图片) 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 (使分心) 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.
Researchers did experiments on kids in order to find out ______.

A．how they really feel when they are learning

B．whether mood affects their learning ability

C．what methods are easy for kids to learn

D．the relationship between sadness and happiness

The researchers found in the first experiment that ______.

A．kids who listened to happy music turned out to be energetic

B．kids who listened to sad music liked to choose smiley faces

C．kids worked harder in the background of happy music

D．sad music helped kids find out small shapes quickly

What can we learn from the text?

A．The researchers will continue to do experiments.

B．The researchers have found a clear answer.

C．The experiments are popular among kids.

D．Kids change their feelings more easily.

We can infer that the text is ______.   

A．a science survey	B．a research report
C．a school project	D．an introduction to an experiment