Homework can put you in a bad mood, but that might actually be a good thing.New research suggests that, in some cases, being too happy can hurt your performance on certain kinds of tasks.To test whether it is true, researchers performed two learning experiments with children.
The first experiment included 30 children, aged 10 and 11.Each child was given 20 problems in which a houselike shape was hidden inside a different, larger image.The children had to find the small shape while sitting in a room.Either positive or sad classical music was played in the background.
As a measure of mood,the scientists asked the children to point to ont of five faces,ranging from happy to sad.Children listening to the positive music tended to point to the smiling faces.Children surrounded by sad music pointed instead to the frowns(皱眉).The researchers found that sad children took at least to find the small shapes and also correctly found on average three or four more shapes.
In the second experiment,61 children,aged 6 and 7,faced the same type of problems.They watched one of three scenes.One scene was happy.One was neutral(中立的).One was sad.And just like in the first experiment; kids who felt sad or neutral performed better on the tests.They solved on average two or three more problems.
The researchers think that feeling down causes people more likely to fix their attention on a problem or difficult situation.However, other studies suggest that people who feel happy are better able to fix their attention on details.Some researchers insist that the new studies have flaws.It’s possible that the lively music in the first experiment took children’s attention away from their task of finding shapes.
While scientists continue to work on finding the answers,it will might be worth adapting your tasks for your mood.
What did the researchers want to find out the experiments?

A．What determines success in children’s study

B．How to train children to keep a happy mood

C．Whether and how children’s moods affect their performance

D．Whether too much homework affects children’s moods

What did the two experiments have in common?

A．Children were divided into happy and sad groups

B．Children were asked to find hidden shapes

C．Children in a sad moon were considered much cleverer

D．Researchers used music to measure children’s moods

Through the two experiments, researchers think that sadness cause people to___.

A．perform better in some cases

B．become cleverer than before

C．pay more attention to details

D．be more likely to be influenced by music