C
Lying is hard work for your brain
"I'll finish my homework before playing video games."
"Your dress looks beautiful."
"I won't spend all the money on snacks."
All lies! Most of us have told a lie at one time or another. However, scientists found that lying can harm your brain（大脑）. It may stop you from doing other important tasks.
● Hard work
When you tell the truth, your brain doesn't have to do any extra（额外的） work. But lying takes much more work.
Imagine you're late for class. The teacher asks why and you decide to lie. So you say, "I picked up a book from the library." Your teacher asks, "The book I assigned（布置） last time?" Then you must decide how to answer the question. If you say yes, the teacher might ask to see the book. So you might say, "No." Now you have to think of a book title. You need to make sure it's a book the library actually has. See? When you lie, your brain works a lot more to keep the lie from falling apart.
●Expensive lies
You just gave your brain a ton of extra work. An area called the prefrontal cortex（前额皮质） does the work. It's the part in charge of（掌管） short memory. That area also takes care of planning, problem-solving and self-control.
Using too much brainpower（脑力） to lie means there's less available for other things—like solving math problems. Lying is even harder for young people. The prefrontal cortex is not fully developed until age 25. So when young people are busy with lying, they'll have a harder time doing other things, like making study plans or eating a healthy diet. So think twice before lying next time.
1. What did the scientists find out about telling lies?
A. It happens quite often.
B. Most students have done it.
C. It is bad for people's brains.
D. It is an important way to protect oneself.
2. What happens to your brain when you lie?
A. It works more slowly.
B. It has to do some extra work.
C. It often says yes to others.
D. It becomes better at answering questions.
3. What does the prefrontal cortex help people do?
a. Build long-term memories.
b. Make plans.
c. Work out problems.
d. Relax our brains.
A. ab
B. bc
C. ac
D. bd
4. According to the story, why is it harder for people under 25 to tell lies?
A. Because they are not clever enough.
B. Because they have too much brainpower.
C. Because they are still learning how to talk to other people.
D. Because they don't have fully grown brains.
5. Which statement is TRUE according to the passage?
A. If someone says "Your dress looks beautiful", your dress is really good.
B. If you lie when you are late to school, you don't need think a lot.
C. When you are lying, you have to tell more lies to make others believe you.
D. When you are lying, your brain stops developing.

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