股票的价格弹性或者恢复能力，以交易价格受大额交易冲击后的恢复能力来衡量，价格恢复能力

下列心脏杂音的产生机制，正确的是（）。

A.只要血流速度加快，即使没有血管狭窄也可产生杂音

B.随着血液粘稠度的增加，不仅产生杂音而且强度增大

C.患有瓣膜病变者，当血流速度减慢时也可产生杂音

D.瓣膜口狭窄越严重，产生的杂音越强

E.动脉壁局限性扩张时，血流速度减慢而不产生杂音

依照我国《合同法》的规定，合同双方当事人之间互负债务，有先后履行顺序，应当先履行债务的当事人，有确切证据证明对方经营情况严重恶化，（）履行合同。

A.应当终止

B.可以终止

C.应当中止

D.可以中止

    2008年世界石油价格总体趋势不断攀升，各地“油荒”大有蔓延之势，对社会许多领域造成了严重影响。下表反映了世界主要发达国家能源强度对比情况（能源强度：一次能源供应总量与国内生产总值的比率。电力强度：单位产值所消耗的电能，它反映了经济增长率与电力消费之间的关系）。据此回答1—2题。

1、表中反映出[ ]

A、单位产值耗油量最大的是英国

B、单位产值耗电量最大的是美国

C、法国能源总量比英国丰富

D、发达国家人均能耗均较少

2、日本的能源强度与电力强度值对我国的启示是[ ]

A、广开进口渠道

B、改进技术，提高能源的利用率

C、改变能源消费结构

D、节约能源，加强能源储备

正常人动脉血pH是

A．7.55～7.65

B．7.25～7.35

C．7.35～7.45

D．7.15～7.25

E．7.45～7.55

阅读理解。

     Technology today has stolen away our voices and robbed our children of memories.  I've been keeping count of how often people sing around the house these days. The fact is,they don't.

      My earliest memories are of my mother crooning lullabies(催眠曲) in a gentle low voice as she rocked each infant in tum.  She said she " didn't have a singing voice," but her low,wavering alto will always mean

comfort to me.  Every

time I have sat through the night with a feverish body or held a pre-schooler through a nightmare,the

melodies returned, words appearing and disappearing like fragments of a dream but held together by the

hum(低声吟唱)  of love.

     Today,young mothers are routinely presented with lullaby tapes at the baby shower. When baby cries,

the idea goes,they will be able to switch on the high-tech audio system and the little one will drift off with

the voices of strangers in his ears,perfectly on pitch.  If I had my way,new parents would learn the songs

themselves,throw out their stereos,and give their child the gift of their own sleepy voices through the

midnight hours.

      These days,when we go on a trip,my daughters take along tiny personal stereos and headphones.

They are lost in their private worlds,and I can't help wishing that at least here,in the car,my girls would be

forced to listen to their mother's voice raised in lost-the-words again,sure I'm out-of-tune songs that they

might then pass down to another generation.  Those sophisticated earphones have robbed them of

something I think every kid should carry from childhood car trips into adulthood.

      I drove away from that party humming,and all the way home the good old songs kept tumbling out.  

Dammit(该死) ,I thought,why did I ever stop singing in the car and start tuming on the radio instead?

Why don't I sign anymore while I'm doing the dishes? I'm going to yank those stereo wires right out of

the wall when I get home.  We're going to sing grace before meals,sing coals around the piano,sing in the

shower instead of switching on that waterproof radio that stole away our voices and our souls.

1. The author hates today's technology because____.         

A. driving a car requires high concentration

B. children are learning pop songs from tapes

C. children have lost touch with good old songs

D. high-tech systems do not record the voices of aged people

2. The underlined sentence "the little one will drift off" in Paragraph 3 means that___.   

A.  the play of the high-tech system is of little use

B. the high-tech system will play on and on

C. the low voice will delight the baby

D. the baby will slowly go to sleep

3. To the author,the voices of strangers ______.

A. are not familiar to the baby          

B. lack the motherly love the baby need

C. work better to stop the baby's cry              

D. surely sound more pleasant

4. What the author wishes to make her girls do is to ______   

A. help memorize the words while she is singing

B. take off their well-designed earphones

C. listen and learn the old songs from her

D. remember their childhood car trips