单选题Human beings are superior to animals because they can use language as a tool of communication.

单选题The reviewed the international situation in which important changes and great upheavals are taking place and ______ their respective positions and attitudes. A. expanded B. devoided C. expounded D. expired

单选题Her talk at the seminar clearly, ______ from the topic the supervisor expected in the field of sociology.

单选题This program will take kids who have a manifest history of violent acts.

单选题By the time Bob arrives in Beijing, {{U}}we have already arrived here for two days{{/U}}.

单选题When a person falls into the state of sleep, his ______.

单选题The campers ______ their tent in a sheltered valley. A. established B. installed C. pitched D. fixed

单选题Your grade will be based in large part on the originality of your ideas. A. creativity B. popularity C. feasibility D. flexibility

单选题He painted his bedroom black. It looks dark and dreary. He should choose a different color.

单选题According to conflict theorists, social control agents and systems are ______.

单选题The eastern bluebird is considered the most attractive bird native of North America by many bird-watchers.

单选题A court-martial has but recently decided to {{U}}acquit him{{/U}}.

单选题Just last week, for example, the World Health Organization (WHO) announced the disturbing disclosure that chick flu may be pretty deadlier than previously believed.

单选题I saw with my own eyes he took up the purse and put it in his handbag. A. had taken up the purse and put it in his handbag. B. was taking up the purse and putting it into his handbag. C. take up the purse and put it into his handbag. D. has taken up the purse and putting it into his handbag.

单选题 Specific brain disorders can affect the perception of music in a very specific way. Experiments done on epileptics decades ago showed that stimulating certain areas of the temporal lobe on both sides of the brain awakened "musical memories"—vivid re-creations of melodies that the patients had heard years earlier. Lesions in the temporal lobe can result in so-called musicogenic epilepsy, an extremely rare form of the disorder in which seizures are triggered by the sound of music. Autism offers an even greater puzzle. People with this condition are mentally deficient, yet most are proficient musicians; some are "musical savants" possessed of extraordinary talent. The opposite is true of the less than 1 percent of the population who suffer from {{U}}amusia{{/U}}, or tree tone deafness. They literally cannot recognize a melody, let alone tell two of them apart, and they are incapable of repeating a song (although they think they are doing correctly). Even simple, familiar tunes such as Frere Jacques and Happy Birthday are mystifying to musics, but when the lyrics are spoken rather than sung, musics are able to recognize the song immediately. But for instrumentalists, at least, music can evidently trigger physical changes in the brain's wiring. By measuring faint magnetic field emitted by the brains of professional musicians, a team led by Christo Pantev of the University of Muenster's Institute of Experimental Audiology in Germany has shown that intensive practice of an instrument leads to discernible enlargement of parts of the cerebral cortex, the layer of gray matter most closely associated with higher brain function. As for music's emotional impact, there is some indication that music can affect levels of various hormones, including cortisol (involved in arousal and stress), testosterone (aggression and arousal) and oxytocin (nurturing behavior) as well as trigger release of the natural opiates known as endorphins. Using PET canners, Zatorre has shown that the parts of the brain involved in processing emotion seem to light up with activity when a subject hears music. As tantalizing as these nits of research are, they barely begin to address the mysteries of music and the brain, including the deepest question of all: Why do we appreciate music? Did our musical ancestors have an evolutionary edge over their tin-eared fellow? Or is music, as M. I. T. neuroscientist Steven Pinker asserts, just "auditory cheesecake," with no biological value? Given music's central role in most of our lives, it's time that scientists found the answers.

单选题He chose medicine but found, once again, some lack of meaning and so interrupted his studies first to collect ______ up the Amazon River and later to spend time recuperating from illness by a trip to Europe. A. laments B. fragments C. specimens D. commons

单选题According to the passage, where do most Americans live?

单选题Since the energy crisis, these big cars have become a real liability. They cost too much to run.

单选题When I found the light switch, the unshaded bulb only illuminated two small eats, sitting on the table ______ round the inside of the empty ham tin. A. swallowing B. gorging C. licking D. digesting

单选题If you ordered through an agent, please check with the agent to ______ that your order was received and processed.