GPS测量应用于建立各等级的测量控制网时所采用的方法是（）。A．事后差分 B．位置差

丁颖根据我国栽培稻种的起源、演变和栽培发展过程，把它们分为5级，其中第一级为（）和（）两个亚种。

Laugh and Smile Your Way to Health

How much do you laugh and smile during the day? Do you take your life and your illness or injury so   36    that there is no room for joy to fill you? Want a totally free, simple way to increase your    37    and your health with no medicine needed? Then laughing and smiling is   38  to you

So laugh your way to happiness.   39    it takes to put a smile on your face is what you should be doing.  

Research shows that laughing can increase the immune system,   40    the body to stay disease free and fight colds and the flu.

If you are facing an illness , having a positive life opinion and a   41    of humor will keep your body open to healing. If you are healthy, laughing will help to make sure you stay that way, and can    42    enjoyment to your work and home life and   43   your daily stress.

Certainly, it can be   44   to keep a positive opinion of life all the time. Simply taking the time to   45   on the positive and treat for the good things    46   in your life can help   47   , but if you are struggling with negative emotions that you just can’t seem to    48    , there are tools that can help.

There are so many things out there to smile about and   49  you have to do is find   50   . Practice looking for the bright   51   of every situation. Avoid the negative：don't   52    yourself with your own problems—or    53    others for their "shortcomings." And don’t pay no attention to the joy in everyday things. Create your own "Laugh for Health"   54    —anything to add to your collection and to give you fresh materials that   55  to you.

36.A. proudly               B.seriously                   C.carefully                   D.freely

37. A.burdens               B.spirits                       C.loads                         D.values

38. A.beneficial             B.changeable                C.suitable                     D.harmful

39. A.However              B.Whenever                  C.Whatever                  D.Whichever

40.A.helping            B.making                            C.letting                       D.causing

41. A.taste                   B.sense                         C.knowledge                 D.joy

42. A.adjust                  B.adapt                        C.apply                        D.add

43. A.improve              B.arise                         C.cancel                       D.reduce

44. A.hard                    B.awful                        C.energetic                   D.helpful

45. A.concentrate          B.put                           C.focus                        D.interview

46. A.carefully                B.thankfully                 C.particularly                D.differently

47..A.remarkably          B.accidentally               C.frequently                 D.purposefully

48.A.seek                  B.stress                        C.accept                       D. overcome

49. A.all                       B.that                           C.how                          D.why

50. A.it                        B.that                           C.this                           D.one

51. A.side                        B.plan                         C.aspect                  D.future

52.A.depend                 B.abandon                    C.load                          D.ban

53.A.praise                   B.miss                          C.approve                     D. blame

54. A.ambition               B.summary                   C.message                    D.collection

55.A. appeal                 B.apply                        C.center                       D.assume

患者男性，67岁。慢性咳嗽、咳痰20余年，进行性气急加重5年。一周前因感冒后病情恶化入院，血气分析（呼吸空气时）示pH7.30，PaO48mmHg，PaCO65mmHg，予以低浓度氧疗。

强调持续性氧疗是由于（）

A.为了保证组织氧提取的持续性

B.为了避免CO潴留加重

C.为了避免PaO波动幅度过大

D.间歇氧疗在停止吸氧时已升高的PaCO不会迅速降低，PaO更加降低，缺氧恶化

E.以上都不是

现浇混凝土楼板的用途说法正确的是下列( )。

A．梁式楼板多用于净空要求不大的厨、厕和步廊

B．无梁楼板多用于楼层荷载较大的商场，展厅

C．组合楼板多用于居住建筑

D．板式楼板多用于大跨度建筑

下列字符中，其ASCII码值最小的是( )。

A．A

B．a

C．k

D．M