题目内容：

    What were you like as a teenager? I was a nightmare. I was rude to my parents, always stayed out late, never did my homework, hung out with the wrong people and made lots of bad decisions. Obviously, this is the age when teenagers are out of control and behave badly. Maybe, if you’re a teenager now, you think this is unfair judgment or it’s not your fault. Well, you might be right!

Experts have found that it’s a teenager’s brain that is to blame. Between the ages of about 13 to 19 — a period known as adolescence, the brain is still developing in areas that control behavior. This has an influence on learning and multitasking, stress and memory, sleep, and decision-making. For parents, these results often make them notice lots of behaviors that they may have earlier blamed on hormones (荷尔蒙) or just moodiness.

So our brains are still developing much later than it was thought before. Is this the perfect excuse for teenagers to walk around aimlessly and not get their homework done on time? Of course not! According to Professor Sarah-Jayne Blakemore, who made the new discovery, it’s to do with our prefrontal cortex that’s the part of our brain right at the front, just behind the forehead. She says “It takes part in a whole area of very high-level cognitive (认知的) tasks such as decision making and planning — we know that this area is going through very large amounts of development during the adolescent years”. This is the part of the brain which plays an important role in planning, and, for a teenager, this hasn’t developed yet. So getting organised to do their homework, for example, can come as a bit of challenge.

I wish I’d known about this because instead of telling my teacher I’d left my homework on the bus or that the dog had eaten it. Now I could say, “Sorry sir, my brain isn’t developed enough for the cognitive task of planning my homework.”

1.Which of the following is common in teenagers?

A.Doing some bad deeds.

B.Being blamed for their age.

C.Stopping their brain development.

D.Making excuses for their bad behaviors.

2.What do we know about the new discovery?

A.The brain develops in the first few years of life.

B.The forehead stops developing during adolescence.

C.Hormones take responsibility for teenagers’ behaviors.

D.The prefrontal cortex affects us performing cognitive tasks.

3.What is the best title for the text?

A.Behind the adolescence

B.Inside a Teenager’s Brain

C.For the Naughty Teenagers

D.About the brain Development