6130柴油机的汽缸数是（）。 A.2 B.4 C.6 D.8

Everything that humans hear is in the form of waves (波).Just as the eye sees light wares in the form of colors, the ear and the eye Curs these different waves into signals that the brain (大脑) can make sense of.

The ears and brain have an Amazing amities to recognize（识别）particular sounds. For example, a mother often can tell when her baby is crying even if there are other crying babies in the same room. This is because the sound of her baby’s cry has special meaning to her and the brain has recorded is importance.

The ability to recognize sounds improves with experiences. As the brain receives information about sounds from day to day, it stores the information in its memory. When the brain hears new sounds, it gives meaning to them based on the information already in the memory. This is why certain words or songs can make a person happy. Often it is not the words or songs themselves that cause this feeling. The sounds are connected to happy memories for that person.

After hearing process controlled by the brain is to decide where a sound is coming from. One ear is usually closer to the source (来源) of a sound than the other ear is. Sound waves are stronger when they reach the ear that is closer. They also reach the closer ear first. The brain recognizes these differences and uses them to decide the location of the source of the sound.

小题1:Which of the following shows the normal hearing process of a mother hearing her baby crying?

a. The ears receive the sound waves.

b. The mother recognizes her baby’s cry.

c. The ears turn the sound waves into signals.

d. The baby’s cry ravels in the form of sound waves

e. The brain connects the signals to the information in me memory.

A．d-a-c-b-e

B．d-a-c-e-b

C．a-d-c-b-e

D．a-d-c-e-b小题2: Certain words or songs can change tarpon’s moods mainly because of his         .

A．lifestyle

B．personality

C．experiences

D．hobbies小题3:According to the last paragraph, It will be the most difficult for a person who has lost the hearing in one ear to tell         .

A．where the source of a sound is

B．how loud a sound is

C．when a sound starts to appear

D．what makes a sound小题4:What is the best title for this passage?

A．Human Brain’s Amazing Facts

B．Human Hearing Characteristics

C．How to improve Hearing

D．How Do Humans Hear

下图为接在50HZ低压交流电源上的打点计时器，在纸带做匀加速直线运动时打出的一条纸带，图中所示的是每打5个点所取的记数点，但第3个记数点没有画出．由图中数据可求得：

（1）该物体的加速度为______ m/s²

（2）第3个记数点与第2个记数点的距离约为______ cm．

—It's a long time ________ I saw you last.

—Yes, and what a pity it is now that it will be a long time ________ we see each other again. [ ]

A. before; since 

B. since; when    

C. since; before 

D. when; before 

做水泥安定性试验以前，应先做何试验？有何意义？

世界是多元的，东西方文明是相互影响的。一部人类社会发展史，从本质上说就是人类文明演进的历史。阅读材料，回答问题

材料一：

在有马镫以前，骑者的座位是不牢靠的。中国马镫西传，使得新作战方式成为可能，在这样一种西欧新社会形态中获得了表现：那个社会由武士阶级的贵族政治统治着，武士们被赋予土地，使他们能够以一种新颖而高度专门化的方法来打仗。这种贵族不可避免地要发展起和马上白刃战的风格及其社会风尚相协调的文明形态和思想格局。——摘编自《顾准文集》

材料二：

（近代中国）18世纪末叶以后，华夏文明日益感受到从西方基督教文明中崛起的现代工业文明的咄咄逼人的压力。这种压力以资本主义生产方式特有的手段，初则以商业的渗透，继则以赤裸裸的殖民主义武力，迫使中华文明不得不经常地在“生存或灭亡”之间傍徨。..西方文明赢得世界不是通过其思想、价值观或宗教的优势，而是依靠它运用有组织的暴力优势，这在西方文明与华夏文明——两个强势文明的猛烈撞击撞击中表现得尤为充分。——马克垚《世界文明史》

材料三：

当前，全人类正共同面临着一场新的文明转型，如果没有新技术的革命性突破，没有新的全球资源配置体系的革新，人与自然和人与人的矛盾将会迅速激化，人类就有可能越不过这次文明转型的门槛。——潘岳《可持续发展与文明转型》

依据上述材料所述英国、美国和中国经济社会发展对策，分析大国崛起的因素有哪些？