Many people today like reading stories about UFO.Many people in different countries are studying the UFO.

    There are some different saying for UFO.Among those sayings,the most popular one for UFO is that UFOs are strange creatures(生物) to the earth from other stars.We can call them aliens.

    UFO scientists and many people believed this saying.Some people said that they saw a few UFOs landing on the earth.They seemed to be objects rather like big plates.Some people said that they saw some strange visitors coming out of the UFOs.

    Some people make mistakes when they say they have seen UFOs high in the sky.Perhaps they see a weather balloon or an uncommon plane or the light they see in the sky comes from the ground.Sometimes they see the light from the moon.

    But these are a lot of others we can't understand.It may take many years to find a clear answer and then people will give UFO another name.

阅读下面的文段，完成后面题目。

   济南之所以有“泉城”之名，是由于城南有距今4.5亿年前的奥陶系石灰岩组成的千佛山地，这些石灰岩具有较多的熔洞或裂隙，在济南附近没（mò）入地下，并受到不透水的侵入岩岩体的①        （阻挡/阻止），而上覆的第四纪山前堆积物透水性不好，从而形成承压水构造。城南山区接受大气降水补给（jǐ），在城区则以上升泉形式涌出地表向外排出。金代有人立“名泉碑”，列举泉名七十有二，泉水众多，不可胜（shèng）数。历代诸家所论72泉亦不尽相同，②        （大致/大约）为趵突泉、黑虎泉、珍珠泉、五龙潭四大泉群。趵突泉又名瀑流，宋代开始称趵突泉。

   泉城四大泉群会流一处，在济南盆地最低处形成湖面46.5公顷的大明湖。北魏郦道元《水经注》③        （记载/记录），城西南有泺水，“北为大明湖”，后渐填埋堵塞，半为街市。金代起今城内湖沿袭大明湖之名。一湖烟水，绿树蔽空，妖娆多姿，风光秀美。清人刘凤浩咏湖有“四面荷花三面柳，□□□□□□□”，沿湖亭台楼阁，水树长廊，错落有致。其风貌不亚于“接天莲叶无穷碧，映日荷花别样红”的杭州西湖。

完形填空

        I got aboard and sat down in my seat．It was going to be a long flight． Around me were some  1  "Where are you headed?" I asked．

       "Lakes Air Base．We'll be there for special training, and then to the front．"

After about an hour, an announcement was made that box lunches were  2  for five dollars． The journey would be several hours, and I decided to buy one．

        As I 3  for my wallet, I heard a soldier ask his fellows if he would buy lunch．"No, that seems a lot of money for just a box lunch．" I looked around at the other soldiers. 4  were buying lunch．I walked to the back of the plane and  5 the flight attendant a fifty-dollar bill．

        "Take a lunch to all those soldiers．" I said．She seized my arms tightly．Her eyes wet with tears, she  6  me, " My son is a soldier in the front．．．it's almost like you are doing it for him．"

       Picking up ten boxes, she headed to the soldiers．

       After eating, on my way to the rest room I was  7  by a man．"I saw 8 you did and I want to be part of it．" With this, he handed me twenty-five dollars．

       Soon after I returned to my seat, I saw the Flight Captain coming, looking at the seat numbers  9  he walked．When he got to my row he stopped, smiled, held out his10  , and said, "I want to  11  your hand．" I stood and took his hand．With a loud voice he said, "I was a soldier．12 , someone bought me a lunch．It was such an act of  13  that I never forgot．" I was a little bit  14   when applause rang out from all of the passengers．These soldiers were giving their all for our country．I could only give them a couple of meals．

       Later, when I walked to the front of the plane to stretch my legs, a man  15  another twenty-five dollars in my hand．

When we 16  , I gathered my belongings and started to leave．A man stopped me, put something in my pocket, and walked away 17 a word．Another twenty-five dollars! Seeing the soldiers  18  at the terminal, I walked over to them and handed them seventy-five dollars．As I walked  19  to my car, I prayed for their safe  20  .