影响经济增长的因素有哪些？

阅读理解。

     What makes people happier:money or having happy friends and neighbors? Scientists have found

an answer as part of a study.    

     The new study found that friends of happy people had a greater chance of being happy themselves.

And the smaller the distance between friends,the larger the effect they had on each other's happiness.      

     For example,a person was 20% more likely to feel happy if a friend who lived within  l. 5 kilometers.

Having a happy neighbor who lived next door increased the chance of being happy by 34%. The effects

of friends' happiness lasted for up to a year.      

    The scientists found that sadness also spread among friends,but not as much as happiness.      

     People who take 3 degrees out of' separation still had an effect on a person's happiness.3 degrees

of separation means the friend of a friend of a friend.      

     The study showed that having an extra 5 ,000 dollars increased a person's chances of becoming

happier by about 2 percent. But the researchers found that the influence of a friend of a friend of a

friend can be greater than that.

1. The effects of happiness from friends ____.    

A. have a chance of 20%  to make you happy    

B. are usually within l.5km    

C. have a chance of 34% to make you happy    

D．can last about a year

2. The word "spread" in the fourth paragraph means in China?    

A. 传播    

B. 流行    

C. 分享    

D. 兴盛

3. Having a happy friend who lives within one and a half kilometers increases a chance of being

    happy by____.

A. 45%    

B. 50％    

C. 34％    

D. 20％

4. Which of the followings has the greatest effect on happiness according to the passage?    

A. Money.    

B. The friend of a friend.    

C. Happy friends who live in another city.    

D. Happy neighbors.

5. From this passage we know ____.  

A. who's the happiest  

B. what's happiness  

C. what makes people happier  

D. how to make people happy

以下哪些症状为消渴病的基本临床表现

A．多饮

B．消瘦

C．多食

D．多尿

E．嗜睡

如图所示，ACB是一光滑的、足够长的、固定在竖直平面内的“∧”形框架，其中CA、CB边与竖直方向的夹角均为θ．P、Q两个轻质小环分别套在CA、CB上，两根细绳的一端分别系在P、Q环上，另一端和一绳套系在一起，结点为O．图中虚线为竖直线，将质量为m的钩码挂在绳套上，OP、OQ两根细绳拉直后的长度分别用l₁、l₂表示，若l₁：l₂=2：3，则两绳受到的拉力之比F₁：F₂等于（　　）

A．1：1

B．2：3

C．3：2

D．4：9

关于Casoni氏试验

A．阳性率为90%～93%

B．必须用新鲜的囊液行皮下注射

C．皮下红晕大于2cm为阳性

D．是用术中的棘球蚴囊液作为抗原

E．泡状棘球蚴的阳性率更高

养老保险的特点是什么？