利用()原则，可以保证结构的稳定性和管理的有效性。A.动力 B.能级 C.激励 D.

用化学用语填空：

（1）汞元素 _________ ；

（2）三个氢原子 _________ ；

（3）两个五氧化二氮分子 _________ ；

（4）3个氢氧根离子 _________ ．

具有维持基础血压和对血压起调节作用的交感神经元位于（）。

A.海马内室旁核

B.脑桥

C.延髓前中部

D.尾缝核

E.延髓前外侧

既能增强抗凝作用，又能减少出血的透析抗凝药是()

A．低分子肝素

B．常规肝素

C．中分子肝素

D．肝素钙

E．潘生丁

农民田某于2001年去国外打工时在途中遇海难失踪，从此杳无音讯。2006年其妻胡某向当地人民法院申请宣告田某死亡，人民法院经审理判决宣告田某死亡。由于年幼的女儿田燕身体一直不好，家中又没有足够的经济能力给田燕治疗，2007年胡某将田燕送给膝下无子的邻村姚某收养，并办理了合法的手续。2008年，失踪多年的田某突然返回，法院随即撤销了对田某的死亡宣告。田某要求与胡某恢复夫妻关系，并提出田燕的收养未征得他的同意，违反我国《收养法》，是无效的，要求撤销收养合同。姚某与胡某都不同意，田某诉至法院。
问：

田燕的送养是否有效

阅读理解。

      Many countries such as Iraq, Uganda, Guatemala, and many others have been known to abduct (诱拐)

children and force them to serve in the army. The reason is that the enemy isn't likely to suspect children as

a real threat. Many non-government organizations are also known to abduct and force children into being

child soldiers. Below we have some quotes from former child soldiers. 

      "The army was a nightmare. We suffered greatly from the cruel treatment we received. We were often

beaten, mostly for no reason at all, just to keep us in a state of terror. I still have a scar on my lip and sharp

pains in my stomach from being violently kicked by the older soldiers. The food was not enough, and they

made us walk with heavy loads, much too heavy for our small bodies. They forced me to learn how to fight

the enemy." 

                                                                                                                                      — Emilio, 14

       They gave me pills that made me crazy. When the craziness got in my head, I beat people on their heads

and hurt them until they bled. When the craziness got out of my head, I felt guilty. If I remembered the person,

I went to them and apologized. If they did not accept my apology, I felt bad. 

                                                                                                                                      — Michael, 13

       As seen in the quotes, the army is not very friendly toward children. Forced to act like adults, kill like

adults, and carry an adult's load, these children sometimes die from exhaustion (筋疲力尽). Below are some

facts about child soldiers.

       Today, as many as 300,000 children under the age of 18 serve in government forces or armed rebel

groups. Some are as young as eight years old. Children are most likely to become child soldiers if they have

no money to buy food and clothes. Many children join armed groups because of economic or social pressure,

or because children believe that the group will offer food or safety. Child soldiers are used all over the world.

Here is a list of where child soldiers are used.

1. Many countries force children to serve in the army because ______. [ ]

A. children are brave and strong

B. the enemy doesn't consider children as a threat

C. there aren't enough adults to join the army

D. they think children are very easy to control

2. Which of the following words can best describe Emilio's feeling about his army life? [ ]

A. Adventurous

B. Happy

C. Boring

D. Terrible

3. When Michael became crazy, he would ______. [ ]

A. try to kill people

B. apologize to people

C. beat people violently

D. feel guilty about himself

4. According to the passage, many children who become child soldiers ______. [ ]

A .are very poor

B. have lost their parents

C. are loyal to their country

D. are braver than other children