In distance is a tall tree which is sai

如下图所示，在“探究运动和力的关系”的实验中，每次都让小车从斜面顶端处由静止开始滑

下，改变水平面的粗糙程度，测量小车在水平面上滑行的距离，结果记录在下表中。

（1）从能量转化角度看，小车每次滑行到斜面底端时具有相同的＿＿＿能。

（2）若小车在水平木板上滑行3s后停止，位置如上图所示。则小车的平均速度为＿＿＿m/s。

（3小车在铺有毛巾表面上滑行距离最短，是因为＿＿＿＿＿＿＿＿＿＿＿＿＿。

（4）在此实验的基础上进行合理的推理，可以得到：一切运动的物体不受外力作用时，它将＿＿＿＿＿＿

＿＿＿＿＿＿＿＿＿＿＿。

阅读理解

      Children become more generous as they get older, learning the principles of equality by the age of

eight.That may not be too surprising to anyone who has kids.

     Humans are born with a sense of fairness that most other animals seem not to share, but it's not been

clear exactly when this concept starts to develop.

     Dr.Alva Zhao and her colleagues conducted a series of tests to measure just how much children care

about equality at different ages.In three different versions of a game, children were asked to choose

between two ways of sharing a number of sweets with themselves and an unfamiliar partner.They could

choose, for example, between one for me and one for you, or just having one for themselves.

      At the age of three, children were "almost completely selfish", says Zhao.

     They refused to give sweets away even if it made no difference to themselves.But by the age of eight,

children generally preferred the fair option, sharing a prize equally rather than keeping it all to themselves.

      Several other factors influenced how fair the children were.The team found that children without

brothers or sisters were 28% more likely to share than children with brothers or sisters.On the other

hand, the youngest children in a family were 17% less willing to share than children who had only

younger brother or sister.

     In addition, if children knew that their partner was from the same playgroup or school, they were

more concerned about being fair.This suggests that being nice to people you know is something that

develops a sense of equality.

1. The main idea of the first paragraph is________.

A. parents know clearly when their kids are more willing to share

B. the kids' willingness of sharing is learned from their family

C. the older the kids are, the more selfish they will become

D. kids become more generous when they reach a certain age

2. The tests conducted by Dr.Alva Zhao and her colleagues were aimed at________.

A. how kids develop a quality of fairness in games

B. children's awareness of equality at different ages

C. the reasons why children care about equality

D. children's attitudes towards other partners

3. Which of the following is NOT true according to the passage?

A. Children under three know little about being fair.

B. Children above eight years old become less selfish.

C. Children with brothers or sisters tend to be more generous.

D. The youngest child in a family tends to be less generous.

4. We can learn that children care more about equality while with________.

A. unknown people  

B. nice people

C. familiar people

D. fair people

对于领导者来说，（）是第一位的。

A.道德素质 

B.政治素质 

C.能力素质 

D.知识素质

雌激素对丘脑下部及脑垂体前叶的反馈是

A．雌激素——负反馈，孕激素——负反馈
B．雌激素——正反馈，孕激素——负反馈
C．雌激素——负反馈，孕激素——正反馈
D．雌激素——正负反馈，孕激素——负反馈
E．雌激素——负反馈，孕激素——正负反馈

《中华人民共和国矿产资源法》规定：非经国务院授权的有关主管部门同意，不得在( )区域开采矿产资源。

A．国家划定的自然保护区所在地
B．矿产资源品位低的
C．国家重点保护的不能移动的历史文物和名胜古迹所在地
D．铁路、重要公路两侧一定距离以内
E．城镇市政工程设施附近一定距离以内