下列物质不能由单质之间的化合反应得到的是 [ ] A．NO B．NO2 C．Mg

病历摘要：患者，女性，26岁，2小时前突发右下腹突发撕裂痛，遂入急诊求治。疼痛为间歇性，伴有肛门坠胀便意感。患者已婚，停经10天后 * * 不规则出血，点滴状，色暗红，近段时间加班多。查：患者痛苦面容，面色苍白，右下腹拒按，T37℃，P80次/分，R20次/分，血压80/40mmHg。

该病人本病的辨证分型？（）

A.异位妊娠未破损型

B.异位妊娠破损型

C.异位妊娠不稳定型

D.淤血内阻证

E.气血阻滞证

F.气血虚弱型

为保证人身安全，除专业人员外，其他人员(包括所携带的物件)与铁路牵引供电设备带电部分的距离，不得小于(　　)m。

A．1

B．2

C．5

D．9

My secret of staying young is quite simple：devote your attention to the part of you that’s young and growing—your brain. Keep your mind awake and you will stay young all over. These are exciting times. Take an interest in the world around you，and make a point of learning one new thing every day.

No matter how old you are ，it’s not too late to make your life more interesting. I know a housewife without knowledge in the past who made herself into an excellent industrial designer. I know an old electrical engineer who has become a highly paid artist.

Get over the idea the you are too old to go back to school. I know a man who entered a medical college at 70. He got his degree with honors and became a famous doctor. Another man went to a law school at 71 and now is an active lawyer.

No matter how old people are，staying young is easy for those who live in the future. You can do it if you are active enough to try. Keep your mind active and awake：that’s the only youth elixir.

54. Which of the following best express the main idea of this passage？

Staying young is the only youth elixir.

Learning at least one new thing every day.

Never too late to go back to school.

The secret of staying young.

55.  If you wish to stay young，above all ，you should        .

A. keep your mind awake and active      B. make your life more interesting

C. keep your mind from being harmed     D. keep in tough with other people

56. The implied meaning of the passage is that        .

A. anyone can learn to do something no matter how old they may be.

B. the electrical engineer learned to be an artist to become famous.

C. the man who entered the medical collage at 70 came out at the top of the list.

D. every one can be successful if you try to learn no matter how old he may be

57. The word “elixir”in the last sentence probably means something that can keep people        .

A. healthy             B. wealthy            C. young               D. happy

请联系实际论述，你对政府信任关系建构原则的理解。

货物运输保险单中，属于船名未定的保单是（ ）

A．流动保险单

B．暂保单

C．预约保险单

D．总括保险单

E．保险凭证