题目内容
Curt Dunnam bought a Chevrolet Blazer with one of the most popular new features in high-end cars: the OnStar personal security system. The heavily advertised communications and tracking feature is used nationwide by more than two million drivers, who simply push a button to connect, via a built-in cellphone, to a member of the OnStar staff. A Global Positioning System, or G. P. S. , helps the employee give verbal directions to the driver or locate the car after an accident. The company can even send a signal to unlock car doors for locked-out owners, or honk the horn to help people find their cars in an endless plain of parking spaces. The biggest selling point for the system is its use in thwarting car thieves. Once an owner reports to the police that a car has been stolen, the company can track it to help intercept the thieves, a service it performs about 400 times each month. But for Mr. Dunnam, the more he learned about his car’s security features, the less secure he felt. He has enough technical knowledge to worry that someone else-law enforcement officers, or hackers-could listen in on his phone calls, or gain control over his automotive systems without his knowledge or consent. "While I don’t believe G. M. intentionally designed this system to facilitate such activities, they sure have made it easy," he said. Mr. Dunnam said he had become even more concerned because of a federal appeals court case involving a criminal investigation, in which federal authorities had demanded that a company attach a wiretap to tracking services like those installed in his car. The suit did not reveal which company was involved. A three-judge panel in San Francisco rejected the request, but not on privacy grounds; the panel said the wiretap would interfere with the operation of the safety services. OnStar has said that its equipment was not involved in that case. An OnStar spokeswoman, Geri Lama, suggested that Mr. Dunnam’s worries were overblown. The signals that the company sends to unlock car doors or track location-based information can be triggered only with a secure exchange of specific identifying data, which ought to deter all but the most determined hackers, she said. The three-judge panel rejected the request of the federal authorities because ______.
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Many people believe the glare from snow causes snow blindness. Yet, dark glasses or not they find themselves suffering from headaches and watering eyes, and even snow-blindness, when exposed to several hours of "snow light". The United States Army has now determined that the glare from snow does not cause snow-blindness in troops in a snow-covered country. Rather, a man’’s eyes frequently find nothing to focus on in a broad expanse of a snow-covered area. So his gaze continually shifts and jumps back and forth over the entire landscape in search of something to look at. Finding nothing, hour after hour, the eyes never stop searching and the eyeballs become sore and the eye muscle aches. Nature balances this annoyance by producing more and more liquid which covers the eyeballs. The liquid covers the eyeballs in increasing quantity until vision blurs. And the result is total, even though temporary, snow-blindness. Experiments led the Army to a simple method of overcoming this problem. Scouts ahead of a main body of troops are trained to shake snow from evergreen bushes, creating a dotted line as they cross completely snow-covered landscape. Even the scouts themselves throw lightweight, dark-colored objects ahead on which they too can focus. The men following can then see something. Their gaze is arrested. Their eyes focus on a bush and having found something to see, stop searching through the snow-blanketed landscape. By focusing their attention on one object at a time, the man can cross the snow without becoming hopelessly snow-blind or lost. In this way the problem of crossing a solid white area is overcome. Snow-blindness may be avoided by ______.
大约三分之一的儿童希望长大后当科学家，这是因为科学家为加速技术进步作出了巨大贡献。但孩子们也应懂得任何一项科研成果都是长期努力和思考的结果。科研需要献身精神和学术诚信。没有对科学的好奇和热爱，就不可能成为著名的科学家。
Many people believe the glare from snow causes snow blindness. Yet, dark glasses or not they find themselves suffering from headaches and watering eyes, and even snow-blindness, when exposed to several hours of "snow light". The United States Army has now determined that the glare from snow does not cause snow-blindness in troops in a snow-covered country. Rather, a man’’s eyes frequently find nothing to focus on in a broad expanse of a snow-covered area. So his gaze continually shifts and jumps back and forth over the entire landscape in search of something to look at. Finding nothing, hour after hour, the eyes never stop searching and the eyeballs become sore and the eye muscle aches. Nature balances this annoyance by producing more and more liquid which covers the eyeballs. The liquid covers the eyeballs in increasing quantity until vision blurs. And the result is total, even though temporary, snow-blindness. Experiments led the Army to a simple method of overcoming this problem. Scouts ahead of a main body of troops are trained to shake snow from evergreen bushes, creating a dotted line as they cross completely snow-covered landscape. Even the scouts themselves throw lightweight, dark-colored objects ahead on which they too can focus. The men following can then see something. Their gaze is arrested. Their eyes focus on a bush and having found something to see, stop searching through the snow-blanketed landscape. By focusing their attention on one object at a time, the man can cross the snow without becoming hopelessly snow-blind or lost. In this way the problem of crossing a solid white area is overcome. A suitable title for this passage would be ______.
简述在什么情况下建造合同可以分立和合并。
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