回答问题(六) 论中美学校之差别+3-D打印超体验
A
American schools are quite different from those in China. In America, at the beginning of the term, students must select(挑选) their subjects and teachers first.
Selecting is very important for your marks in America. So at the first term, don't select too many subjects, or you'll feel very nervous and tired. Then you have to ask for some teaching plans. There is some information about subjects, time arranging, marks and textbooks. At the same time, you must choose the teachers. Different teachers have different teaching methods. If the teacher is called “killer” by the last grade, many students will give up choosing him, because this kind of teacher will give too much homework, have too many exams and give too low grades. There is another thing after you select the subjects and teachers. How to buy textbooks makes each student feel hard. The textbooks in America are very expensive. Each one is about $30-50.In order to save money, many students buy some used textbooks, and some students usually borrow textbooks from the school library.
In class, discussing is very important. The teachers encourage you to ask questions or show your own opinions. They don't usually ask you to sit well. Instead they allow you to sit or stand anywhere you like.
1.What must students do at the beginning of the term in America?(不超过10个词)
2.Why will many students give up choosing the teacher called “killer”?(不超过20个词)
3.What's the main idea of this passage?(不超过10个词)
B
If your pen broke at school today, what would you do? You would go to a shop and buy a new one. What if you could simply print out a real, working pen with your 3-D printer without leaving your room?
Ten years ago people could only see 3-D printing in science fiction movies. But now 3-D printing is here and it's bringing big changes.
Unlike normal printing that can only copy a 2-D picture with ink, 3-D printing can build almost anything made from material. The printer layers(分层) the material in different shapes to create the object you want to be copied.
The 3-D printer has been used to make many different things. People have made cups, cars and even an airplane with it.
Doctors have been using 3-D printers for several years. People's nervous systems have been printed out in 3-D form medical research. Some body parts have been printed and used in hospital. Several months ago, doctors used a 3-D printer to rebuild the face of a person who had a bad accident. In the future, it is expected that the printer will make human organs to save more lives.
However, there are drawbacks to the printer. At the moment, printing can be quite slow and it's still rather expensive. The average price of a household printer is around $1,700, not including the cost of the materials.
But as the technology develops, it shouldn't be long before disadvantages are improved. Only time will tell where this new technology will take us.
