写一条语句，使页面每隔30s自动刷新。

 阅读下面的短文，按要求完成短文后的题目。

     One day an Australian farmer, Joe, saw a bright light in the sky. 1 The light came nearer and nearer

and suddenly Joe saw that it was a spaceship .The spaceship landed in a field quickly.

     The door of the spaceship opened and two strange beings climbed out. 2 They seemed to be half man

and half bird. Joe was afraid of them. He tried to run away. But the spacemen walked towards him,

picked him up and carried him into the spaceship. They put wires( 电线) from a machine onto his head

and they could speak to him in English.

     They asked him some questions about the earth. "We are from Venus," they said, "but it's getting very

hot there .A lot of our people are dying and we don't have much time left. We are trying to find a new

home."

     After some time they 3 freed Joe and  at last the spaceship took off  and could not be seen again. Joe

told his friends about the spaceship, but no one believed his story.

     "You'll believe me one day," Joe told them. "The spaceman will come back…"

1. 翻译1 处画线部分的句子。

    _____________________________________________________

2. 不变句意，改写2 处句子。

    _____________________________________________________

3. According to the conversation between Joe and the aliens, what do we know about Venus?

    _____________________________________________________

4. 3处单词的意思是___________.  

A. let …go  

B. paid no money  

C. took away  

D. locked

5. 用文中的两个词填空。

(1) Some people ________ in everlasting life after death.

(2) The girls are ________ of going out at night.

（11分）右图是某生物兴趣小组对一个农田生态系统做调查之后，所绘制的食物网简图。请根据右图回答问题。

(1)在该生态系统中有       条食物链，若以X代表该食物网中的某生物，那么对于食物链：“植物→昆虫→X→蛇”，X既可以代表蛙，也可以代表       。

(2)从生态系统的组成成分看，图中的动物属于农田生态系统的       者。

(3)收获季节，有不少农民在田里焚烧农作物的秸秆，造成大气污染。针对这一现象，兴趣小组的同学向有关部门建议建造沼气池，利用秸秆生产沼气。那么，分解秸秆产生沼气的生物属于生态系统中的       者。

(4)在这个生态系统中，绿色植物通过光合作用固定光能转化为化学能储存在有机物中,这些能量是通过       和食物网依次进行传递的。能量传递具有单向性和逐级递减的特点，因此在这个生态系统中       的数量最多。

(5)如果往农田中喷洒农药，有毒物质会通过食物链不断积累，最后体内有毒物质最多的生物是       。

(6)通过调查，兴趣小组的同学们认识到：在自然生态系统中，各种生物的数量和所占的比例总是相对稳定的，这说明了生态系统具有一定的          能力，但这种能力是有限的。如果人们为了一时的经济利益，大量捕捉农田生态系统中的蛇、蛙、鸟，就会造成  　  、 　  的大量繁殖，这个生态系统也就会遭到      ，所以人们不要随意灭杀某种动物，因为动物在维持生态系统的稳定性中起着重要的作用。

社会调查研究

如图所示，匀强电场中A、B、C三点构成一个直角三角形，把电荷量C的点电荷由A点移动到B点，电场力做功J，再由B点移到C点电荷克服电场力做功J，取B点的电势为零，求A、C两点的电势及场强的方向．

在层次数据库中，父片段和子片段之间只能具有______类型的联系。