单选题Questions 23 to 25 are based on the recording you have just heard.

单选题We can conclude from the passage that the scientific means for recycling solid waste________.

单选题{{B}} Questions 11 to 18 are based on the conversation you have just heard.{{/B}}

单选题Some hard plastics can be ______ metals in manufacturing machine parts.

单选题Under what conditions can the EPA put off its action?

单选题The results showed that attractive males utterly defeated unattractive men, but the women who had been ranked most attractive ______ received the fewest votes.

单选题 BQuestions 19 to 21 are based on the conversation you have just heard./B

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单选题There a canal was being built to ______ commerce between the two countries.

单选题Passage ThreeQuestions 33 to 35 are based on the passage you have just heard.

单选题According to the first paragraph, modern historians ______.

单选题"Lie detectors", those controversial assessors of truth, are making their way into everyday life. Insurance companies use them to help catch people filing fraudulent claims. Suspicious spouses use hand-held versions to judge whether their significant others are cheating. Interrogators for the U.S. government use them to double-check analyses of who might be terrorists. Polygraphs, which have been used for decades, have been joined by new systems that purportedly (据称) analyze a person's voice, blush, pupil size and even brain waves for signs of deception. The devices range from costly experimental devices that use strings of electrodes or thermal imaging to $19.95 palm-sized versions. No studies have ever proven that lie detectors wore Many show that they assess truth as accurately as a coin flip; in other words, not at all. Still, some people have come to depend on them. "It helps me to live in a world of reality," said Saul, 36, a Manhattan resident who bought the $3000 device from a local spy shop. The recent proliferation of lie detectors has reignited a decades-old debate over the ethics and politics of when and how they should be used and whether such important questions as guilt or innocence should be left to machines. Mankind has looked for centuries for a physical indicator that would expose a liar. The Romans studied the entrails (内脏) of suspected liars. In China, rice was shoved into the mouths of interviewees to measure how dry they were. The drier the mouth, the more likely the person was lying, it was thought. Other cultures tried various chemical concoctions (计策), but they worked no better than chance. Especially since Sept.11, law enforcement agencies consider lie detection systems critical to their investigations. The CIA, FBI and Defense Department have spent millions of dollars on them. In an unusual plea made soon after the terrorist attacks, the government asked for the public's help in building counterterrorism technologies, among them a portable polygraph. In the United States, there is a double standard when it comes to the use of polygraphs. Although the so-called lie detector is considered an important law enforcement tool, polygraph data are inadmissible as evidence in a court of law. The U.S. Supreme Court forbade private companies from using them to screen job applicants, but allowed the government to use them for the same purpose. As debate about polygraphs' rages, the devices are being phased out in favor of voice analyzers, which are more portable and easier to use. The federal government officially says it does not use these voice lie detectors. Still, the voice technology has its true believers, among them more than 1200 police departments nationwide, traveler's check issuers, and tens of thousands of consumers.

单选题Whichofthefollowingisthebesttitleofthepassage?

单选题Questions 19 to 21 are based on the passage you have just heard.

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单选题[此试题无题干]

单选题Questions 11 to 18 are based on the conversation you have just heard.