多选题Once his integrity had been ______, the mayoral candidate was quick both to ______ these attacks and to issue counterattacks.

多选题The candidate"s comments during the debate were so ______ that not even his most vehement critics could seize on something to use against him.

多选题Information about Abigail and John Adams is so ______ because of the wealth of letters the couple exchanged during John"s frequent absences.

多选题The ______ with which merchants and landowners in early-nineteenth-century Maryland and Virginia ______ Joshua Johnston professional services attests to his artistic skill as a portrait painter.

多选题Most human behavior is ______: that is, it tends to ______ a norm.

多选题The molecules of carbon dioxide in the Earth's atmosphere affect the heat balance of the Earth by acting as a one-way screen. Although these molecules {{U}}allow radiation at visible wavelengths{{/U}}, where most of the energy of sunlight is concentrated, {{U}}to pass through{{/U}}, they absorb some of the longer-wavelength, infrared emissions radiated from the Earth's surface, radiation that would otherwise be transmitted back into space. For the Earth to maintain a constant average temperature, such emissions from the planet must balance incoming solar radiation. If there were no carbon dioxide in the atmosphere, heat would escape from the Earth much more easily. The surface temperature would be so much lower that the oceans might be a solid mass of ice. Today, however, the potential problem is too much carbon dioxide. The burning of fossil fuels and the clearing of forests have increased atmospheric carbon dioxide by about 15 percent in the last hundred years, and we continue to add carbon dioxide to the atmosphere. Could the increase in carbon dioxide cause a global rise in average temperature, and could such a rise have serious consequences for human society? Mathematical models that allow us to calculate the rise in temperature as a function of tile increase indicate that the answer is probably yes. Under present conditions a temperature of -18℃ can be observed at an altitude of 5 to 6 kilometers above the Earth. Below this altitude (called the radiating level), the temperature increases by about 6℃ per kilometer approaching the Earth's surface, where the average temperature is about 15℃. An increase in the amount of carbon dioxide means that there are more molecules of carbon dioxide to absorb infrared radiation. As the capacity of the atmosphere to absorb infrared radiation increases, the radiating level and the temperature of the surface must rise. One mathematical model predicts that doubling the atmospheric carbon dioxide would raise the global mean surface temperature by 2.5℃. This model assumes that the atmosphere's relative humidity remains constant and the temperature decreases with altitude at a rate of 6.5℃ per kilometer. The assumption of constant relative humidity is important, because water vapor in the atmosphere is another efficient absorber of radiation at infrared wavelengths. Because warm air can hold more moisture than cool air, the relative humidity will be constant only if the amount of water vapor in the atmosphere increases as the temperature rises. Therefore, more infrared radiation would be absorbed and reradiated back to the Earth's surface. The resultant warming at the surface could be expected to melt snow and ice, reducing the Earth's reflectivity. More solar radiation would then be absorbed, leading to a further increase in temperature. According to the passage, atmospheric carbon dioxide performs all of the following functions EXCEPT: A. absorbing radiation at visible wavelengths. B. absorbing infrared radiation. C. absorbing outgoing radiation from the Earth. D. helping to retain heat near the Earth's surface. E. helping to maintain a constant average temperature on the Earth's surface.

多选题Several things, however, suggest that the conventional view needs revising. {{U}}For example,{{/U}} the genus Lingula has an unbroken fossil record extending over more than half a billion years to the present. Thus, if longevity is any measure, brachiopods are the most successful organisms extant. Further, recent studies suggest that diversity among species is a less important measure of evolutionary success than is the ability to withstand environmental change, such as when a layer of clay replaces sand on the ocean bottom. The relatively greater uniformity among the existing brachiopod species may offer greater protection from environmental change and hence may reflect highly successful adaptive behavior. The passage makes use of which of the following? A. Specific examples. B. Analogy. C. Metaphor. D. Quotation. E. Exaggeration.

多选题Deer over growing has dramatically reduced plant ______ in many eastern United States forests; the few surviving plant species are that regrow quickly or that deer find ______.

多选题Scholars' sense of the uniqueness of the central concept of "the state" at the time when political science became an academic field quite naturally led to striving for a correspondingly ______ mode of study. A. thorough B. distinctive C. dependable D. scientific E. dynamic

多选题If a supernova (the explosion of a massive star) triggered star formation from dense clouds of gas and dust, and if the most massive star to be formed from the cloud evolved into a supernova and triggered a new round of star formation, and so on, then a chain of star-forming regions would result. If many such chains were created in a differentially rotating galaxy, the distribution of stars would resemble the observed distribution in a spiral galaxy. This line of reasoning underlies an {{U}}exciting{{/U}} new theory of spiral-galaxy structure. A computer simulation based on this theory has reproduced the appearance of many spiral galaxies without assuming an underlying density wave, the hallmark of the most widely accepted theory of the large-scale structure of spiral galaxies. That theory maintains that a density wave of spiral form sweeps through the central plane of a galaxy, compressing clouds of gas and dust, which collapse into stars that form a spiral pattern. The author's attitude toward the new theory of spiral-galaxy structure can best be described as A. euphoric. B. enthusiastic. C. concerned. D. critical. E. disputatious.

多选题Atfirstthechildrenwere______,butasthemorningprogressedtheybegantolaughandtalkeagerly.A.ostentatiousB.C.reservedD.puerileE.reticentF.solicitous

多选题No longer narrowly preoccupied with their own national pasts, historians are increasingly ______ in that they often take a transnational perspective.

多选题Amanita bisporigera, a variety of destroying angel mushroom, is so ______ that it can be ______ if consumed.

多选题Wanting to appear both ______ and ______, the official tried to cultivate an authoritative yet solicitous public image.

多选题Studies of ______ of turtles are sometimes ______ by the fact that the subjects live so long that researchers retire before the studies can be completed.

多选题Elephants have a sense of smell that is remarkably ______: they can reportedly smell water up to several miles away.

多选题Staring at the abstract painting, Edna could not understand how SO many of her fellow museumgoers could pretend to ______ its meaning, when to her its message was so opaque.

多选题By the end of the long, arduous hike, Chris was walking with a ______ gait, limping slowly back to the campsite.

多选题The corporation"s code of ethics is ludicrous; its principles are either ______, offering clichés in lieu of guidance，or so unspecific as to make any behavior ______.

多选题The mayor is renowned for her ______ temperament, she can be warm and talkative one moment, aloof and supercilious the pext.