已知向量a，b，向量c=2a+b，且|a|=1，|b|=2，a与b的夹角为60°

阅读理解。

     Antifreeze is a liquid (液体) that is added to water to keep it from freezing. When water freezes and

turns to ice, it expands (膨胀). The force of water expanding is so great that it will break the hardest

metal. Water is used in car engines (发动机) to keep them cool while they run, and if this water is allowed

to freeze in winter it can break the iron block of the engine. That is why antifreeze is necessary.

     Water freezes at 0℃；the usual kind of antifreeze will not freeze until the temperature is -40℃. A

mixture (混合物) of five parts of water and four parts of antifreeze will prevent freezing at -18℃; four

parts of water and five parts of antifreeze reduce this to -22℃.

     Alcohol is a kind of good antifreeze, but when the air is running it becomes hot and the alcohol boils

away, so it must be changed very often. Most people use antifreeze that does not boil away when the

engine is running. There are several chemicals that do this. One of the most popular is called ethylene

glycol.

1. People use _____ to keep car engines cool.

A. antifreeze

B. water

C. alcohol

D. ethylene glycol

2. The usual kind of antifreeze freezes at _____.

A. 0℃

B. -18℃

C. -22℃

D. -40℃

3. We use antifreeze in order to _____.

A. keep alcohol in water

B. stop ice from becoming water

C. make the freezing point of water lower

D. raise the freezing point of water

4. Besides alcohol, _____ is another kind of popular antifreeze.

A. water

B. ethylene glycol

C. any chemical

D. any mixture

5. The text is written to _____.

A. tell us what antifreeze is

B. make people buy antifreeze

C. tell us that cars need antifreeze

D. show us how to protect car engines

Sometimes I really doubt whether there is love between my parents. Every day they are very busy trying to __36__ in order to pay the high tuition for my brother and me. They don’t act in the __37__ ways that I read in books or I see on TV. In their opinion, “I love you” is too __38__ for them to say. Sending flowers to each other on Valentine’s Day is even more out of __39__.

One day, my mother was sewing a quilt. I sat down beside her. “Mom, I have a question to ask you. Is there __40__ between you and Dad?” I asked her in a very low voice. She didn’t answer immediately. She __41__ her head and continued to sew the quilt.

I was very worried because I thought I had _42_ her. I was _43__ and I didn’t know what I should do. But at last I heard my mother say the following words:

“Susan,” she said thoughtfully, “Look at this thread．Sometimes it __44_, but most of it disappears in the quilt. The thread really makes the quilt __45__. If life is a quilt, then love should be a thread．It can hardly be seen __46_, but it’s really there. Love is __47__.”

I listened carefully but I __48__ her until the next spring. At that time, my father suddenly __49_ seriously. My mother had to stay with him in the hospital for a month. When they returned from the hospital, they both looked __50 _. It seemed both of them had had a serious illness. After they were back, every day in the morning and dusk, my mother helped my father __51__ on the country road．

“Dad, how are you feeling now?” I asked him one day.“Susan, don’t __52__ me.” he said gently. “To tell you the truth, I just like walking with your mom.”__53__ his eyes, I know he loves my mother deeply.

Once I thought love meant flowers, gifts and __54__. But from this experience, I understand that love is just __55__ in the quilt of our life. Love is inside, making life strong and warm.

31．A．keep fit              B．rise early                    C．earn money         D．collect fortune

32．A．magic                B．romantic                    C．fantastic                 D．attractive

33．A．simple                B．easy                          C．relaxing                 D．luxurious

34．A．the question        B．question                    C．reach                     D．control

35．A．feeling               B．love                          C．quarrel                   D．smile

36．A．raised                 B．shook                        C．nodded                  D．bowed

37．A．hurt                   B．injured                      C．wounded                D．harmed

38．A．in great surprise                                         B．in a great embarrassment

C．with deep depression                                  D．at extreme sorrow

39．A．happens              B．comes about               C．appears                  D．occurs

40．A．warm and soft     B．hot and hard              C．thin and cool      D．strong and durable

41．A．somewhere and sometime                           B．anywhere or anytime

C．more or less                                              D．here and there

42．A．inside                 B．outside                      C．faraway                D．nearby

43．A．could believe    B．couldn’t understand  C．wouldn’t recognize   D．might know

44．A．got sick              B．got stuck                   C．threw up                 D．became disabled

45．A．quite healthy       B．very pale                   C．fairly red                D．much surprised

46．A．jump high          B．go hurriedly               C．run fast                  D．walk slowly

47．A．think about         B．talk with                    C．worry about        D．laugh at

48．A．Reading             B．Seeing                       C．Saying                   D．Writing

49．A．fresh roses        B．gold ring                 C．sweet kisses        D．beautiful jewelry

50．A．a thread        B．a needle              C．the cloth         D．the cotton

当环境温度变化时，家畜为了护身，维持行为中什么变化最为明显，是判定求的重要指标？（）

A．活动量

B．采食量

C．姿势变化

D．饮水量

基金管理公司的内部控制是指公司为防范和化解风险，保证经营运作符合公司的发展规划，在充分考虑内外部环境的基础上，通过建立组织机制、运用管理方法、实施操作程序与控制措施而形成的系统。( )

家用缝纫机使用（）传动。

A、平带

B、V带

C、圆带

D、齿轮