49．Which idea is NOT true according to the passage?

A．People who have cars would never like to walk in the open air．

B．You can get help from others when you make mistakes．

C．You can still be a happy person even if you have little money．

D．Happiness is always around you though difficulties come towards you．

48．What will your friend say to you when you make great progress?

A．Oh，so do I．      B．Congratulations．    C．Good luck．         D．It's just so-so．

47．When you fall down in a PE class，both，your teacher and your classmates will _________．

A．laugh at you                              B．play jokes on you

C．quarrel with you                          D．help you up

46．Those who have big houses may often feel _________．

A．happy             B．lonely             C．free                D．excited

45．The people had to leave the place in New Mexico _________．

A．because bad weather stopped the growth of trees

B．because they no longer had water and the land became sand

C．because they didn't have enough trees for burning or building

D．because there was too much rain there

C

Happiness is for everyone，You don't need to care about those people who have beautiful houses with large gardens and swimming pools or those who have nice cars and a lot of money and so on．Why? Because those who have big houses，may often feel lonely and those who have cars may want to walk on the country roads at their free time．

In fact，happiness is always around you if you put your heart into it．When you are in trouble at school，your friends will help you；when you study hard at your lessons，your parents are always taking good care of your life and your health；when you get success，your friends will say congratulations to you；when you do something wrong，people around you will help you to correct it．And when you do something good to others，you will feel happy，too．All these are your happiness．If you notice a bit of them，you can see that happiness is always around you．

Happiness is not the same as money．It is a feeling of your heart．When you are poor，you can also say you are very happy，because you have something else that can't be bought with money．When you meet with difficulties，you can say loudly you are very happy，because you have more chances to challenge yourself．So you cannot always say you are poor and you have bad luck．As the saying goes，life is like a revolving door．When it closes，it also opens．If you take every chance you get，you can be a happy and lucky person．

44．Why did people usually live in place with lots of trees?

A．Trees could tell the change of the weather．

B．Trees brought lots of sunshine and rain．

C．Trees could make weather not too hot or too cold．

D．Trees could be used for burning and for building houses．

43．If you want to find out the weather of twenty years ago，you should study in the tree from the outside to the inside．

A．the twentieth ring                        B．the tenth ring

C．the nineteenth ring                        D．the twenty-first ring

42．The scientists are interested in studying tree rings became it can tell _________．

A．whether a tree was strong or not

B．whether people took good care of the trees or not

C．whether the climate was good or not

D．how old the trees were

41．_________ in good climate．

A．Tree rings are far from each other             B．Tree rings become thinner

C．Trees don't need sunshine or rainfall            D．People can cut down most of the trees

40．What did the owners do while the dog was barking?

A．They stopped it．                                B．They got up quickly．

C．They shouted for help．                   D．The story did not tell us．

B

Do you know something about tree rings（年轮）?Do you know they can tell us what the weather was like，sometimes even hundreds of years ago?

A tree will grow well in a climate（气候）with lots of sunshine and rainfall（降雨量）．And little sunshine or rainfall will limit（限制）the growth of a tree．We can see the change of climate by studying the tree rings．For example，to find out the weather of ten years ago，count the rings of a tree from the outside to the inside．If the tenth ring is far from the eleventh ring，then we are sure that it was sunny and rainy most of that year．If it is near to the eleventh ring，then the climate of that year was bad．

Tree rings are important not only for studying the history of weather but also for studying the history of man．Many centuries ago there lived a lot of people at a place in New Mexico．But now you can find only sand there--no trees and no people．What happened?

A scientist studied the rings of dead trees there．He found that the people had to leave because they had cut down all the trees to make fires and buildings．As all the trees had gone，the people there had to move．