文章大意：本文是说明文。文章通过一个著名公司的领导人的想法：想要理解一个科目，就把介绍给孩子们，解释了人们在向别人甚至自己解释后，更有可能记住和理解他们所学到的概念。
2 . A famous company’s leader believes there’s only one way to know if you truly understand a subject: Can you explain it to a child? But the man with lifelong love of math recently found it didn’t always go well when he tried explaining mathematical concepts(概念)to his then-school-aged children.
He thinks that learning with kids to see what’s puzzling to them and what’s easy for them are the final test of whether you know a topic—whether you can explain it.
Teachers often ask students to give a statement on a subject to show that they understand it. Studies show that people are more likely to remember and understand concepts they’ve learned after explaining them to someone else or even to themselves.That means you can testyour own knowledge in a subject simply by trying to teach it to a friend,to see both how much information you’ve kept and how well you actually understand its concepts. If they successfully learn from you, it’s a good sign that you’re on the right track.
The leader, who studied math and computer science at university, noted that while hewas personally good at math as a high school student, he had trouble passing that enthusiasm(热情)to his three kids.
He loves doing math, but in the past his younger daughter would always say that he made it so complicated (复杂的) and he didn’t need to explain this to her. Because she just wanted to know the answer.
Today, his three children are all in their 20s.While they may not have enjoyed the math lessons, he says that one of his favorite things is teaching calculus(微积分)to the kids.There are a few very difficult concepts in calculus.He must explain why calculus is so important and why calculus has those funny symbols. It’s crazy and it’s probably the thing he enjoys the most.
1. What happened to the leader recently?
| A．He explained Chinese well. |
| B．He developed his lifelong love of math. |
| C．He met a challenge in playing with his kids. |
| D．He had trouble explaining mathematical concepts to his kids. |
2. What does the author encourage people to do in paragraph 3?
| A．Communicate with others actively. |
| B．Build relationship with others. |
| C．Manage to describe themselves. |
| D．Know about their own learning by teaching others. |
3. What did the leader’s younger daughter care about?
| A．Describing an example. | B．Learning with her father. |
| C．Getting the final answer. | D．Keeping enthusiasm high. |
4. What does the leader think of his teaching calculus to his children?
| A．It brings him happiness. | B．It helps his kids grow. |
| C．It gives him a lesson. | D．It improves his maths. |
