小华同学为了探究重力势能与哪些因素有关,他用三个相同的木桩插入同一水平沙面上,且

题型:问答题

问题:

小华同学为了探究重力势能与哪些因素有关,他用三个相同的木桩插入同一水平沙面上,且插入的深度相同.将质量为m和2m的两个重物由相同高度h处分别落在两个木柱上,再将质量为m的重物从高度2h处落下,落到第三个木桩上,用刻度尺量取三个桩下陷的深度,将实验所得的有关数据分别列表如下:

实验序号质量/kg高度/m木柱下陷的深度/m
10.210.05
20.410.1
30.220.1
(1)分析比较实验序号1和2及观察到的现象,可得出的结论是:______;______.

(2)分析比较实验序号1和3及观察到的现象,可得出的结论是:______;______.

(3)进一步综合分析比较表中数据,可归纳得出的结论是:______.

考点:势能的影响因素控制变量法和科学探究的过程
题型:问答题

男性患者,20岁,双手抖动3年。查体:面部表情少,双手震颤,步行运动迟缓,眼科检查见K-F环,该患者最可能的诊断是

A.小舞蹈病

B.帕金森病

C.特发性震颤

D.帕金森综合征

E.肝豆状核变性

题型:问答题

下列哪些先天性发育异常是寰枢不稳的常见原因()

A.Klippel-Feil短颈畸形

B.齿突发育畸形

C.某些与染色体异常有关的畸形等

D.寰椎枕骨化

E.枕颈融合

题型:问答题

女,21岁,反复关节红肿疼痛,活动后心悸气促1天入院。查:梨形心界,心率88次/分,律齐,心尖区舒张期隆隆样杂音,P2亢进,Hb88g/L;胸片结果如图所示。可诊断为()

A.左房粘液瘤

B.贫血

C.风心病、二尖瓣狭窄

D.冠心病

E.Austin-Flint杂音

题型:问答题

下列各器官中,与食物接触面积最大的是(  )

A.胃

B.小肠

C.食道

D.咽

题型:问答题

Passage Four

Bringing More Humor and Laughter into Our Lives
在生活中带进更多的幽默和笑声
The sound of roaring laughter is far more contagious than any cough, sniffle, or sneeze. Humor and laughter can cause a domino effect of joy and amusement, as well as set off a number of positive physical effects. Humor and laughter strengthen our immune systems and help us recover from illness, as well as bring joy into our lives. The question is: how do we gain access to this priceless medicine
A good hearty laugh can help
reduce stress
lower blood pressure
elevate mood
boost immune system
improve brain functioning
protect the heart
connect you to others
foster instant relaxation
make you feel good
Humor is a powerful emotional medicine that can lower stress, dissolve anger and unite families in troubled times. Mood is elevated by striving to find humor in difficult and frustrating situations. Laugh at yourselves and the situation helps reveal that small things are not the earth- shaking events they sometimes seem to be. Looking at a problem from a different perspective can make it seem less formidable and provide opportunities for greater objectivity and insight. Humor also helps us avoid loneliness by connecting with others who are attracted to genuine cheerfulness. And the good feeling that we get when we laugh can remain with us as an internal experience even after the laughter subsides.
Mental health professionals point out that humor can also teach perspective by helping patients to see reality rather than the distortion that supports their distress. Humor shifts the ways in which we think, and distress is greatly associated with the way we think. It is not situations that generate our stress, but it is the meaning we place on the situations. Humor adjusts the meaning of an event so that it is not so overwhelming.
Here are some additional things we can do to improve our mood, enjoyment of life and mental health.
Attempt to laugh at situations rather than bemoan them—this helps improve our disposition and the disposition of those around us.
Use cathartic laughter to release pent-up feelings of anger and frustration in socially acceptable ways.
Laugh as a means of reducing tension because laughter is often followed by a state of relaxation.
Lower anxiety by visualizing a humorous situation to replace the view of an anxiety-producing situation
Our work, marriage and family all need humor, celebrations, play and ritual as much as record-keeping and problem-solving. We should ask the questions "Do we laugh together " as well as "Can we get through this hardship together " Humor binds us together, lightens our burdens and helps us keep things in perspective. One of the things that saps our energy is the time, focus and effort we put into coping with life’s problems including each other’s limitations. Our families, our friends and our neighbors are not perfect and neither are our marriages, our kids or our in-laws. When we laugh together, it can bind us closer together instead of pulling us apart.
Remember that even in the most difficult of times, a laugh, or even simply a smile, can go a long way in helping us feel better.
Laughter is a birthright, a natural part of life. The part of the brain that connects to and facilitates laughter is among the first parts of the nervous system to come on line after birth. Infants begin smiling during the first weeks of life and laugh out loud within months of being born. Even if you did not grow up in a household where laughter was a common sound, you can learn to laugh at any stage of life.

The good feeling derived from laughter can stay with us as______even after the laughter stops.

A.an inner experience

B.a lifelong experience

C.an outward experience

D.a mental reward

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