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A．of his being ever there
B．he ever has been there
C．of his having ever been there
D．of him having ever been there
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A、observer
B、façade
C、Abstract Factory
D、none of the above.
Thus, rockslides occur more frequently during the spring, when heavy rains and melting snow are most prevalent.
Many mass wasting processes are described as slides. Rockslides occur when a coherent mass of rock breaks loose and slides down a slope as a unit.A If the material involved is largely unconsolidated, it is called a debris slide. Slides are among the fastest and most destructive mass movements. Usually rockslides occur in a geologic setting where the rock layers are inclined, or where there are joints and fractures in the rock that are parallel to the slope.B When such a rock unit is undercut at the base of the slope, it loses support and the rock eventually collapses. Rain or snowmelt can trigger a rockslide by wetting the underlying surface to the point that friction can no longer hold the rock in place.C The fastest type of slide is a rock avalanche, in which a mass of rock literally floats on air as it moves downslope. The high speed of a rock avalanche is the result of air becoming trapped and compressed beneath the falling mass of debris, allowing it to move down the slope as a buoyant sheet. D
Resonance is observed many times without consciously thinking about it; for example, one may find an annoying vibration or shimmy in an automobile, caused by a loose engine mount vibrating with increasing amplitude because of an out-of-round tire. The bulge on the tire slaps the pavement with each revolution; at the natural resonance point of the engine mount, it will begin to vibrate. Such vibrations can result in considerable damage if allowed to persist. Another destructive example of resonance is the shattering of a crystal goblet by the production of a musical tone at the natural resonant point of the goblet. The energy of the sound waves causes vibration in the glass; as its amplitude increases, the motion in the glass exceeds the elasticity of the goblet, and it shatters.
An instrument called a tachometer makes use of the principle of resonance. It consists of many tiny bars, loosely fastened together and arranged so that each bar can slide independently of the others. Movement of the bars causes changes in a dial. When placed next to a rotating motor or engine, the tachometer picks up slight vibrations which are transferred to the resonant bars. These bars begin to move, and the resulting dial may be read to find the revolutions per minute of the motor very quickly.
An object, if moving rhythmically when stimulated in a natural period, is said to ______.
A．vibrate
B．resonate
C．swing
D．oscillate
Tomatoes: With their load of vitamin C, tomatoes are the richest source of the fiery red pigment lycopene, which has been shown to defend against malignancies of the lungs, cervix, prostate, and mouth(47). If they need to ripen, leave them in a cool spot in your kitchen for a day or two.
Oranges: Like all citrus fruits, oranges are known for their aromatic oils and high vitamin C content.(48)
Garlic: Garlic could be your ticket to longevity. The same sulfur compounds that give the bulb its pungent flavour protect against cancer both by neutralizing carcinogens and slowing tumors' growth. If you don't care for garlic, take heart: onions, leeks, shallots, and chives deliver many of the same cancer-fighting substances.
Tea:(49). One recent study found that certain of these compounds appear to keep newly formed tumor cells from growing out of control, a trick they pull off by restoring a chemical in the body that limits how many times the rogue cells can divide.
Whole Wheat:(50). Grain-lovers ran one-third the risk of people who rarely ate whole grain bread or cereal.
A. Loaded with nutrients and fiber, grains have many of the same phytochemicals as fresh produce.
B. But berries of every kind offer benefits.
C. A lot of people in China like to drink tea because it's traditional.
D. Whatever you do, don't put fresh tomatoes in the fridge unless you want to spoil their flavour and texture.
E. Tea is rich in antioxidants called polyphenols.
F. Citrus-lovers show comparatively low rates of stomach and lung cancers.
The panel—called the Commission to Assess the Ballistic Missile Threat to the United States—was set up by the National Defense Authorization Act of 1997 and first met in January 1998. Its nine policymakers; technologists, and senior military officials had "unprecedented access to the most sensitive and highly classified information," said panel chairperson Donald Rumsfield, a former secretary of defense, at a press conference here. The panel found that liberalized export controls, increased international exchanges of students and scientific personnel, and leaks of classified information have resulted in "massive technology transfer" both from developed nations to rogue nations and between those countries themselves. Moreover, potential aggressors could minimize the technical challenge by settling for missiles with limited accuracy or reliability.
The report warns that nations with Scud missile technology, such as Iran, could test a long-range missile within about 5 years from deciding to pursue such a program. North Korea also has the technology for producing biological weapons, the panel noted. Test flights of their missiles that would be able to reach parts of Hawaii and Alaska could take place within 6 months of a decision. Because of the United Nations arms inspections, however, Iraq is lagging behind and would take 10 years from initiating an effort to posing a missile threat to the United States.
Speaker of the House Newt Gingrich called the report "the most important warning about our national security since the end of the Cold War," and urged the establishment of a bipartisan, bicameral committee to work with the Administration to decide: future policy. A White House spokesperson was noncommittal, saying that the report's recommendations on intelligence analysis would be taken into account, but that the administration stood by its March intelligence assessment. That report concluded that it is unlikely that countries other than Russia, China, or North Korea could deploy a ballistic missile capable of reaching any part of the United States before 2010.
The U.S. intelligence community and the Clinton Administration think that______
A．the U.S. will not be attacked by missile in the near future
B．other countries may attack the U.S. with missile right after they declare war
C．the U.S. may haw a sudden missile attack
D．the U.S. will never be attacked by missile
A．conspire
B．deviate
C．distort
D．sabotage
In the first form, known as primary cooperation, group and individual unite. The group contains nearly all of each individual's life. The rewards of the group's work are shared with each member. There is an interlocking identity of individual, group, and task performed. Means and goals become one, for cooperation itself is valued.
While primary cooperation is most often characteristic of preliterate societies, secondary cooperation is characteristic of many modem societies. In secondary cooperation, individuals devote only part of their lives to the group. Cooperation itself is not a value. Most members of the group feel loyalty, but the welfare of the group is not the first consideration. Members perform. tasks so that they can separately enjoy the fruits of their cooperation in the form. of salary, prestige, or power. Business offices and professional athletic teams are examples of secondary cooperation.
In the third type, called tertiary cooperation or accommodation, latent conflict underlies the shared work. The attitudes of the cooperating parties are purely opportunistic; the organization is loose and fragile. Accommodation involves common means to achieve antagonistic goals; it breaks down when the common means cease to aid each party in reaching its goals. This is not, strictly speaking, cooperation at all, and hence the somewhat contradictory term antagonistic cooperation is sometimes used for this relationship.
What is the author's main purpose in Paragraph 1 of the passage？
A．To explain how cooperation differs from competition and conflict
B．To show the importance of group organization and attitudes
C．To offer a brief definition of cooperation
D．To urge readers to cooperate more often
Watch Consequences Of US-Libyan Relations
US Secretary of State Condoleezza Rice announced on Monday that the United Stated decided to restore full diplomatic ties with Libya and clear the nation from the list of terrorism-supporting countries. The Libyan Government welcomed the decision.
This means that the 25-year-old US-Libyan confrontation comes to an end.
Interpretation of this varies, the sudden announcement of the rapprochement is closely related to the issue of Iran's nuclear bidding.
Over a long period of time, Washington called Libya, together with Iran and others, a "rogue nation", which allegedly supported terrorism, and was one of the seven countries that could be subject to possible US nuclear strikes.
The situation altered somewhat since the outbreak of the Iraqi War in 2003. The military forces of the United States and its allies toppled the Saddam Hussein regime with the excuse that Iraq went in for weapons of mass destruction(WMD) programmes. They did so in hopes of making the regime a public example that would pressure others to give up their alleged WMD bidding.
Iran took no heed of this and went on doing what it deemed should be done. Libya, however, was cooperative, abandoning its so-called WMD programmes.
For the co-operative attitude on the part of Libya, the United States gave some limited encouragement, restoring diplomatic representatives to the country in 2004. But restoration of full diplomatic relations did not occur because Libya, in the eyes of the United States, remained a "totalitarian" country, running counter to Washington's push for US-style. freedom and democracy, even though Libya's co-operation in WMD issues was in the United States' strategic interest.
The deadlock over Iran's nuclear bidding cornered the United States to a dilemma(进退两难的窘境): Military strikes are difficult to carry out right now and diplomatic means are yielding no significant results.
It is in this context that US-Libyan ties were put on the agenda. The United States wanted to convey this message: US-Iranian ties could be restored if Iran follows Libya's example, despite the fact that the United States dislikes the Iranian regime.
The message is naturally not only for the ear of Iran and the Democratic People's Republic of Korea but also for other "rogue countries"—Middle-East nations that are in the throes of transformation and some Latin American countries.
The United States, for instance, decided to impose arms embargo on Venezuela almost simultaneously while it announced rapprochement with Libya. The contrast between the punishment and reward helps bring home to other countries the intention that "those who obey survive, those do not perish" in the US international strategy.
To what extent this kind of "punishment and rewarding" strategy would impact the Iran and DPRK's nuclear bidding and those "disobedient" countries, such as Sudan and Venezuela, is worth keeping an eye on.
Oil constitutes another important factor behind the rapprochement. As the second-largest oil producing country in Africa and an important nation located in the North, Libya enjoys unique geopolitical and economic value.
Currently, the oil -rich Middle East is in chaos and the last thing the Bush administration wants is for the United States to become an "oil hostage" to the Middle East, where the US Government is strenuously pushing for democratic transformation.
The situation is compounded by the fact that some Latin American countries are increasingly tilting to the left, threatening to become an unstable energy-resources backyard for the United States.
In view of all this, opening up new energy resources-supplying bases becomes a strategic imperative for the United States.
More importantly,
A．Y
B．N
C．NG
A.RogueAP
B.无线网桥
C.RogueClient
D.Adhoc终端
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