题目内容：

    Do you have trouble trying to create the next big idea? Sometimes the answer isn’t to just force an idea out of your mind. Instead, you might want to try sitting back, relaxing and letting your mind wander. Yes, you heard that correctly. If you are in need of a new idea, try daydreaming.

Researchers from the university of California, Santa Barbara, found an association between daydreaming and creative problem-solving. Their study includes having participants first do an “unusual-use task”. They had to try to come up with as many different ways to use an object as they could.

Then, the participants chose to do one of the following four things before doing the “unusual-use task” again: complete a difficult task; complete an easy task; take a 12-minute break; or skip the 12-minute break and move right on to the task exercise again.

Surprisingly, the group that performed best was the one that completed the easy task. Many participants reported that they were daydreaming while performing the easy task. So the researchers believed that this daydreaming might have helped unlock their creativity.

But how could daydreaming help the brain come up with creative ways? The answer is something known as “unconscious thought”. Even when you are not actively working to solve a problem, it is still in the back of your mind. Your brain is still thinking about the problem, but in a much more subtle (不易察觉的) way.

When you daydream, your mind is allowed to think in ways it normally would not. Because it is free of control, it can create completely new and out-of-the-box ideas.

Great ideas never come easily, but that does not mean you always have to work hard to get them. Feel free to do what you want and let your mind wander.

1.The “unusual-use task” in Paragraph 2 means that participants ______.

A. complete an easy task B. complete a very difficult task

C. take a 12-minute break D. think of various ways to use an object

2.Why did the participants who completed the easy task perform best?

A. They were not actively working to solve the easy task.

B. They daydreamed and it helped them be more creative.

C. They were daydreaming while performing the difficult task.

D. They skipped the 12-minute break to complete the task again.

3.What does the underlined phrase “unconscious thought” in Paragraph 5 mean?

A. Your brain wander in a subtle way within your control.

B. Your brain knows clearly what you’re thinking and doing.

C. Your brain is thinking about a problem outside of your awareness.

D. Your brain refuses to receive any information from the outside world.

4.The passage mainly wants to tell us that ______.

A. brainstorming is important to creative ideas

B. daydreaming is a way to improve creativity

C. problem-solving skills are important in our lives

D. the more we exercise brains, the more ideas we’ll get