设置单一指标的综合评价在实距中基本上只用于( )。A．方案的优化 B．方案的比选

IEEE 802.11的MAC层采用的是______的冲突避免方法。

论证是揭示论据与论点之间逻辑关系，是论点得以确立和阐明的（ ）

A．根据和手段

B．过程和方法

C．基础和前提

D．目的和结果

For many young people, having to attend school with a parent would be their worst nightmare. However, Senior 1 student Li Qinmei is happy taking her father with her as long as she can go to classes. He is disabled and unable to take care of himself.

The 16-year-old country girl in Zhucheng, Shandong Province has experienced one disaster after another in her short life. Li lost her mother at three. Four years later, her father became paralyzed after a tractor accident. At 12, her misfortune returned with the death of her grandma. Since then she has been forced to shoulder all the responsibility for her broken family.

Li learnt to cook and managed to live a life with an allowance of only 24 yuan per month. The most difficult thing she had to deal with was helping her father bathe, dress and use the toilet as he could hardly move.

"I felt embarrassed, and so did my dad. It was really hard at the beginning," she recalled.

During most of her junior school years, Li went to classes only once a month as her father was seriously ill at the time.

"I taught myself at home and asked teachers for help on my school days," she explained.

Li's hard work paid off this fall. She was admitted by Zhucheng No 1 High School, a local key school, based on her good performance in the entrance exams.

The school offered Li and her father a room on campus to live in so she could look after him during breaks.

Once in a while, Li felt sad when she saw her classmates going shopping or hanging out with friends.

"I envy them sometimes because they have both mum and dad to look after them. However, I soon feel relieved as I still have my dad with me," she said.

Li admitted that the difficulties in life had taught her to be strong.

"I believe I will go on and continue my studies at a good university," she said, in a confident tone.

Her teacher Mr. Wang has the same belief. Li made great progress in the recent monthly exams. "She works hard and is always eager to excel . It's not easy for her never to be late for school, but she has managed to make it work," Wang said.

小题1:Li Qinmei has to shoulder the family because ________.

A．her father was badly injured in a car accident

B．her mother passed away when she was 3

C．her grandma died when she was 12

D．misfortune in her life forced her to do so小题2:From the passage we can infer that _________.

A．Li Qinmei doesn’t like others talking about her father

B．many young students hate going to school with their parents

C．Li Qinmei has made little progress in her study

D．Li Qinmei has lost three relatives and has to take care of her father小题3:What’s the meaning of the underlined phrase “hanging out” in the passage?_________.

A．playing outside

B．working hard

C．exchanging ideas

D．talking happily小题4:What’s the best title of the story?

A．Difficulties make strong

B．A touching story

C．A strong-minded girl-Li Qinmei

D．Li Qinmei’s successful study life

空调系统按空气处理设备设置的集中程度分类，可分为集中式系统、半集中式系统和全分散系统。( )

在斯密看来，国民财富的增长，首先取决于（）。

A.社会分工的发展

B.市场交换发展的程度

C.劳动生产率的提高

D.资本利用效率的提高