单项选择题 Dark Forces Dominate Universe The earth, moon, sun and all visible stars in the sky make up less than one percent of the universe, .Almost all the rest is dark matter and dark energy, unknown forces that___________(51) astronomers.Observations in recent years have changed the basic___________ (52) of how the universe evolved and have indicated how little is known about the major forces and substances that___________(53) our world.Astronomers now know that luminous发光的) matter---stars, planets and hot gas--accounts___________ (54)only about 0.4 percent of the universe. Non-luminous components, such as black holes and intergalactic (星系间的) gas, ___________ (55)up 3.6 percent. The rest is either dark matter, about 23 percent, or dark energy, about 73 percent.Dark matter, sometimes___________(56) 'cold dark matter,' has been known for some time. Only recently have researchers come to understand the key role it___________(57) in the formation of stars, planets and even people.'We ___________ (58) our very existence to dark matter,' said physicist Paul Steinhardt and a co-author of a review on dark matter which (59) not long ago in the journal Science.'Dark matter dominated the structure___________ (60) in the early universe,'Steinhardt saiD．'For the first few billion years dark matter contained most of the mass of the universe. You can think of ordinary matter ___________ (61) a froth (泡沫) of an ocean of dark matter. The dark matter clumps (结成块) and the ordinary matter falls into it.That___________ (52) to the formation of the stars and galaxies (星系.'Without dark matter, 'there would be virtually no structures in the universe.'The nature of dark matter is___________ (63). It cannot be seen or detected directly.Astronomers know it is there because of its___________ (64) on celestial (天体的)objects that can be seen and measured.But the most dominating force of all in the universe is called dark energy, a recently ___________ (65) power that astronomers say is causing the galaxies in the universe to separate at a faster and faster speed. 第 51 题A．worry B．moveC．puzzleD．reject

单项选择题 Every Dog Has Its Say Kimiko Fukuda, a Japanese girl, always wondered what her dog was trying to say.Whenever she put on makeup, it would pull at her sleeve.___________(46) When the dog barks, she glances at a small electronic gadget(装置). The following 'human'translation appears on its screen: 'Please take me with you.' '1 realized that's how he was feeling,' said Fukuda.The gadget is called Bowlingual, and it translates dog barks into feelings. People laughed when the Japanese toymaker Takara Company made the world's firstdog-human .translation machine in 2002. But 300,000 Japanese dog owners bought it. ___________(47)'Nobody else had thought about it,' said Masahiko Kajita, who works for Takara. 'We spend so much time training dogs to understand our orders, what would it be like if we could understand dogs?'Bowlingual has two parts. ___________ (48) The translation is done in the gadget using a dataB．ase(资料库)containing every kind of bark.Based on animal behaviour research, these noises are divided into six categories:happiness, sadness, frustration, anger, declaration and desire. ___________ (49) In this way, the dataB．ase scientifically matches a bark to an emotion, which is then translated into one of 200 phrases.When a visitor went to Fukuda's house recently, the dog barked a loud 'bow wow'.This is'translated as 'Don't come this way'.___________ (50)The product will be available in US pet stores this summer for about US$120. It can store up to 100 barks, even recording the dog's emotions when the owner is away. A．A wireless microphone is attached to the dog's collar, which sends information to the gadget held by the owner.B．Nobody really knows how a dog feels.C．It was followed by 'l'm stronger than you' as the dog growled (嗥叫) and sniffed (嗅)at the visitor.D．More customers are expected when the English version is launched this summer.E．Now, the Japanese girl thinks she knows.F．Each one of these emotions is then linked to a phrase like 'Let's play', 'Look at me',or 'Spend more time with me'. 第 46 题 请选择（46）处的最佳答案．

未知题型 水温28℃，牛蛙头低垂、不动、不吃食、便血；头部、嘴周围、背、腹、腿和脚趾等处可见粉红色溃疡，由病灶处分离到格兰阴性细菌。该病最可能的病原是（）