He was the Beatles' most versatile singer and not just as a __________.

A . as result B . as a result of C . as the result of D . a result of

A . Even though B . Even if C . As if D . As though

A . for B . on C . of D . about

A . Judging B . Judge C . Judged D . To judge

A . stop bank failures B . prevent radical actions in the United States C . prevent the further worsening of the economic situation and lessen the personal sufferings of the people D . prevent further worsening of the unstable political situatio

A．acclaimed B．attested C．ratified D．considered

A．In her ear. B．At home. C．At the party, too.

A．who B．whom C．what D．that

A、was warned, would not eat B、had been warned, would not have eaten C、would be warned, had not eaten D、would have been warned, had not eaten

A．because; that B．because of; that C．because of; so D．because; so

More than 40 years passed before physicists were able to offer an explanation for superconductivity. The accepted theory, developed in the 1950s, holds that the fundamental behavior. of electrons changes at very low temperatures because of the effects of quantum mechanics. Electrons are tiny particles that make up the outer part of an atom, circling rapidly around the nucleus of the atom. In a regular conductor—a metal that conducts an electric current—the outermost electrons are not bound tightly to the atoms, and so they move around relatively freely. The flow of these electrons is an electric current. At normal temperatures, a conductor's electrons cannot move completely freely through the metal because they are "bumped around" by the metal's atoms. But according to the leading theory of superconductivity, when a metal is very cold, electrons form. pairs. Then, like couples maneuvering on a crowded dance floor but never colliding, the paired electrons are able to move unimpeded through the metal. In pairing up, it seems, the electrons are able to "blend together" and move in unison without resistance. This explanation seems to account for superconductivity at extremely low temperatures, but in 1986 scientists in Switzerland found that some metal-containing ceramics are superconductors at much higher temperatures. By 1992, scientists had developed ceramics that become superconducting at - 297'F, and some researchers speculated that room-temperature superconductors may be possible. Scientists are still trying to formulate a theory for high-temperature superconductivity. The new ceramic materials can be maintained at their superconducting temperatures, with relatively inexpensive liquid nitrogen rather than the much colder and much more costly liquid helium required by metal superconductors. The cost difference could make superconductivity practical for many new technologies. For example, magnetically levitated trains, which require superconducting electromagnets, would be much cheaper to build than they are now. Superconducting devices might also be used for advanced power transmission lines and in new types of compact, ultrafast computers. But for the time being, superconductivity is finding application mostly in scientific research and in some kinds of medical imaging devices. The flow of an electric current in a regular conductor is made possible by the fact that______. A．electrons circle rapidly around the atom B．the outermost electron move relatively freely around the atom C．the innermost electrons stick to the atom D．the outermost electrons are bound tightly to the inner ones

A．onset B．outcome C．outside D．outset

A．at B．on C．from D．at

The Tower was also the【10】of one of London's most famous mysteries. King Edward IV died in 1483. His elder son, Edward, became king【11】his father's death. Young Edward lived in the Tower, and the Duke of Gloucester,【12】protector, persuaded Edward s brother, Richard, to come and live there so that they could play together. But then the Duke【13】that he was the new king, and he was crowned instead of the twelve-year-old Edward,【14】himself Richard III. After that, the boys were seen less and less and eventually disappeared.【15】said that they were suffocated in bed by pillows being【16】their mouths. It is believed that Richard ordered their deaths,【17】it has never been proved. In 1674, workmen at the Tower discovered two【18】which were taken away and buried in Westminster Abbey in 1678. The【19】were examined in 1933 and were declared to be those of two children,【20】the age of the Princes. (1) A．seats B．scenes C．grounds D．sights

A.bos.rte is corrupted and needs to be reinstalled. B.The system administration needs to reboot the system. C.The /root part of bos.rte was installed but not the user part. Reinstall the missing software. D.The update CD needs to be applied with the smitty update_all command.

A.In terms of B.On behalf of C.On the basis of D.in the form. of