继承性主要强调子类在父类的基础上取“长”补“短”，而_______主要强调的是类与类

主要用于人寿保险保险经营过程中的一切开支的费用（）。

A.纯保费

B.附加保费

C.营业保费

D.保险金给付额

Exhausted and unhappy, you still have to squeeze a smile to your friends, or teachers. That’s just life, you may think. But new research suggests that putting on a fake smile can worsen people’s mood and even lower work efficiency.

Lead researcher Brent Scott with other researchers studied a group of bus drivers for two weeks. They tried to find out what happened when the drivers were involved in “surface acting” or fake smiling, and the opposite, “deep acting” which means people put on real smiles by recalling pleasant memories or thinking about their current situation more positively.

The results showed that on days when drivers were forced to smile, they felt depressed and didn’t want to work. On days when they smiled due to positive thoughts, their mood improved a lot as well as their work efficiency.

The research goes against the popular belief among companies that employees should be cheerful to customers at all times. They include employees of shops, banks, call center workers and others who have face-to-face contact with members of the public. “Smiling for the sake of(为了) smiling can lead to emotional exhaustion and coldness, and that’s bad for the organization,” Scott told the Daily Mail.

The study also showed that women were harmed more by fake smiling than men. Their mood and work performance both worsened more. But they were helped more by deep acting — their mood became better and they worked more efficiently.

However, while deep acting seemed to improve mood in the short term, Scott says it’s not a long-term solution for unhappiness.

“There have been some suggestions that if you do this over a long period that you start to feel inauthentic(不真实的),” Scott said. “You may be trying to cultivate positive emotions, but at the end of the day you may not feel like yourself anymore.”

小题1:Brent Scott and others’ experiments on bus drivers suggest that ______.

A．depression among bus drivers is common

B．thinking in a positive way helps with work efficiency

C．bus drivers with pleasant memories tend to be less efficient

D．the bus drivers’ work efficiency is determined by their mood小题2:According to the article, which of the following statements about “fake smiling” is TRUE?

A．It is good for the business but bad for the employees.

B．It doesn’t work on people who are emotionally expressive.

C．It is a widely accepted cultural practice in the US.

D．It causes more harm to women than men.小题3:We can conclude from the article that the researchers think that ______.

A．people should be true to their feelings

B．smiling helps to put people in a good mood and become more efficient

C．it is unnecessary to cultivate positive emotions

D．deep acting can improve mood in the long run小题4:The article is mainly about ______.

A．the importance of smiling during face-to-face contact

B．a new study on fake smiling and its influence on people

C．suggestions on improving work efficiency

D．how to cheer up when you are exhausted

    初级产业产品的外销为澳大利亚重要外汇来源之一。近五年来由于降水极少，澳大利亚已面临“百年大旱”。2007年4月，权威人士提出“若近期内没有足够的雨水，即将停止大部分农地的灌溉！”。据此并读图，回答1—2题。

1、“停止农地灌溉”的措施一旦执行，影响最深远的地区是 [ ]

A、甲

B、乙

C、丙

D、丁

2、停止农地灌溉最可能带来的国际性问题是[ ]

A、国际铁矿石和煤炭价格上涨

B、牛羊肉和稻米价格上涨

C、乳品和原油价格上涨

D、羊毛和小麦价格上涨

金属钠蒸气发出的黄光，频率是5.1×10¹⁴ Hz，它以45°的入射角由空气射入玻璃后，折射角是30°，那么它在玻璃中的传播速度和波长如何改变？改变了多少？

一中国女子和一外国男子结婚并定居在该外国，该女子在中国探亲时生下一子。假设根据该外国国籍法规定这个孩子一出生就具有该外国国籍，那么根据中国《国籍法》的有关规定，对于其原始国籍的状况，下列哪种判断是正确的

A．这个孩子可以同时拥有中国国籍和该外国国籍

B．这个孩子只拥有该外国国籍

C．这个孩子只拥有中国国籍

D．这个孩子无国籍