单选题Please make sure that your L/C will reach us well before the shipment month so that we can ______ shipping space for the goods with ABC Line.

单选题Although women duster to him like moths around a flame, he is none ______ happier for it.

单选题Hobsion theory states that through unchecked proliferation of the human species, in twenty years the world"s population will have out, own the total food supply.

单选题After a day's hard work, he was ______ tired. A. dead B. deadly C. die D. dying

单选题Many theories concerning juvenile delinquency suggest that children commit crimes in ______to their failure to rise above their socio-economic status.

单选题Unlike Keynesianism, monetarism eschews direct government control by means of taxation and spending ______ imposing limits on the nation"s money supply.

单选题They rarely study natural events, and only in so far as they ______ on the human world.

单选题His constructive proposal for improving the program is ______of our attention.

单选题"The one in the brown suit gaped at her. Blue suit grinned, might even have winked. The big nose in grey suit still stared—and he had small angry eyes and did not even smile." That is an example of ______.

单选题Being wronged, the little girl tried to______her tears at first, but on seeing her mother, she burst out crying.

单选题It displeases my parents when Richard and I stay out late every night. My parents don't approve______.

单选题There has been a growing concern______pollution. But those who concern themselves______this problem need government support.

单选题Technically, negotiation occurs between people who are interdependent, ______ that the actions of one patty affect those of the other party and vice vers

单选题In the dark they could not see anything clear, but could______.

单选题Joan didn't go to the party last night because she ______the baby for her sister until 9: 30.

单选题This liquid is highly______; it should be kept in a tightly stopped bottle.

单选题I have to______time to prepare for the coming sports meet.

单选题When he arrived in America, he was surprised to learn that the mayor of the city was Chinese by ______. A. nature B. resource C. origin D. source

单选题Local governments assume high-speed railway can change the existing regional economic patterns of cities bring new economic benefits facilitate the rapid development of the new city areas.

单选题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 allow radiation at visible wavelengths, where most of the energy of sunlight is concentrated, to pass through, 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 the increase indicate that the answer is probably yes. Under present conditions a temperature of - 18°C can be observed at an altitude of 5 to 6 kilometers above the Earth.Below this altitude (called the radiating level) , the temperature increasesby about 6°C per kilometer approaching the Earth"s surface, where the average temperature is about 15°C. 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°C： This model assumes that the atmosphere"s relative humidity remains constant and the temperature decreases with altitude at a rate of 6. 5 °C 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.