解析：选B。细节理解题。根据第一段最后一句话"The value of different kinds of metals has increased greatly...，it may be worth a great deal."可知B项正确。

　　3．The "Andrea Doria" sank because________．

　　A．it hit an Italian ship

　　B．it hit a Swedish ship

　　C．there was a strong current

　　D．the water was very deep

　　解析：选B。细节理解题。根据第二段第二句话"It is an Italian passenger ship which sank in 1956 after a collision with a Swedish ship."可知，该船是与瑞典船只相撞后沉没的。

　　4．Divers have tried to bring up things from the"Andrea Doria"because________．

　　A．the water is not very deep

　　B．it is lying on the seabed

　　C．it sank in a collision

　　D．the ship and the things in it are very valuable

　　解析：选D。细节理解题。根据第二段第三、四两句话可知该船及其上面的物品都非常昂贵，故成为潜水者们争相打捞的对象。

　　B

　　Respect your teachers

　　First of all, students should respect the teachers.They should pay attention in the classes.That means to salute him, to stand from his chair when the teacher enters the classroom etc..Attend any lesson attentively.In class of a certain subject or teacher you don't like very much, if it's total anarchy(混乱), how can we talk about respect?

　　Play by the rules

　　If your teacher wants you to use wide­lined paper-do it! If she tells you to sharpen your pencils only before class starts, listen to her.If she doesn't accept late homework, do yours on time.Sometimes classroom rules seem strict or even silly, but most teachers know what's necessary to make things run smoothly, what it takes to let the learning begin.And the better the learning environment, the smarter you'll be!

　　Expect her/him to like you

　　Teachers are teachers because they like kids.Given the chance, most teachers want to be your friends too.Respect your teacher, but don't be afraid of her/him.She/He wants you to have a great school year just as much as you want to have!

　　Put first things first

　　Friends are a fun part of school.But they're not the most important part.When your teacher is teaching, give her/him your full attention.Even when it's hard to do-recess will come soon enough, and that's the time for playing with your friends.

　　【解题导语】　本文主要给学生提出如何与老师相处的几点建议。

　　5．Which of the following would be the best title for the text?

　　A．Advice Before You Go to School

　　B．What You Should Do at School

　　C．How to Get Along With Your Teacher

　　D．How to Plan Your Time at School

解析：选C。标题归纳题。本文主要给出学生与老师相处的几点建议，因此C正确。