49．From the passage we may know that it is                   to use machines to make a person breathe for years if his brain is dead．

A．possible               B．difficult               C．impossible              D．surprising

48．When a person's brain is dead                     ．

    A．his heart can never beat again

    B．he still Can see something

    C．he can breathe again by using a maJ3hine

    D．he can never breathe again

47．If a person is hurt badly and becomes unconscious，he             ．

    A．Can't hear            B．can't speak           C．can't hear                      D．all of above

46．What does the underlined word “unconscious’’ mean．?

A．无意识的                                               B．无视觉的

C．无听觉的                                              D．无言语的

45．What's the best title for this passage? 

    A．Grant and Stockton                                  B．The San Francisco

    C．Chinatown                                                D．San Francisco Chinatown

C

    Suppose a man has a car accident．He is badly hurt and unconscious，that is，he can't think，speak or hear，His family take him to hospital．The doctors tell them that，his brain is dead，but a machine can make him breathe．

    Now the patient's family must make a difficult choice．Should they think he is dead and ask the doctors not to Use the machine and let him die? Or should they ask the doctors to use the machine to make him breathe? Sometimes the machine Can make an unconscious person breathe for years However，if his brain is dead，he will never think，speak or hear again．

    Someone who is unconscious can decide this．Can his family make the decision to let him die?

    Some People take it for granted．They think even if the machine Can keep the person a-live，he will not know anything．It's only a waste of time and money，which may lead the family to a painful life．It only makes family suffer more and longer．

44．When is the best time to visit the Chinatown in San Francisco?

    A．At night                                                 B．During the day．

    C．In the evening                                                  D．In the morning

43．                     is home to many Chinese markets and store．

A．Alley                         B．Government          C．Stocken                 D．Grant

42．Where will you find souvenir shops，antiane stores and restaurants when you are in San Francisco Chinatown?

A．Grant Auenue                                          B．Stockton

    C．North Califorma．                                     D．China alleys

41．When was the Chinatown we see today built?

A．Before l906                                            B．After l960

    C．Before l960                                               D．Afterl906