单选题(Some ways) in which lizards (different) from snake are (in having) ear (openings), moveable eyelids, and less flexible jaws.

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单选题North American bison differ from domestic cattle in have 14 rather than 13 A B C D pairs of ribs.

单选题.The Great Potato Famine in Ireland in the 1840’s caused an unprecedented numbers of A B C people from Ireland to immigrate to the United States. D

单选题United States income taxes are paid to the Internal Revenue Service, -----funds for use by the government.

单选题The universe is estimated ___between 10 billion and 20 billion years old.

单选题The word "precise" in line 13 is closest in meaning to

单选题Machines need energy (to function), (whether) it is animal or human muscle, wind or (waters) currents, or heat-generated energy, (such as) steam.

单选题The word "they" in line 8 refers to

单选题Make sure that transportation to and from the river is arranged to your .

单选题Reports on an organization's projects may fill several major functions at the same time. A report can be used to educate and gain support from key people and groups, to facilitate and inform decision-making about current and future projects, and to provide documentation for the organization's records. The employees who are responsible for preparing the report must have a clear understanding of how the report will be used before they compile it. 3. The word compile in the passage is closest in meaning to

单选题The word "noted" in line 17 is closest in meaning to

单选题Although the huge ice masses _____ glaciers move slowly, they are a powerful erosive force in nature.

单选题Listening4"Professor'sOffice"

单选题According to the passage, the most dramatic change to the oceans caused by plankton during the Cretaceous period concerned

单选题Grandma Moses, the well-known American artist, began (to paint) at the age of 76 (when) she could (no long) do needlework because of arthritis.

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单选题.Rarely has a technological development had as great an impact on as much A B aspects of social, economic, and cultural development as the growth of C D electronics.

单选题BIRD SONG 1 One instance in the animal kingdom with parallels to human music is bird song. Much has recently been discovered about the development of song in birds. Some species are restricted to a single song learned by all individuals, while other species have a range of songs and dialects, depending on environmental stimulation. The most important auditory stimuli for birds are the sounds of other birds, including family or flock members and territorial rivals. For all bird species, there is a prescribed path to development of the final song, beginning with the subsong, passing through plastic song, until the bird achieves the species song or songs. This process is similar to the steps through which young children pass as they first babble and then mimic pieces of the songs they hear around them, although the ultimate output of human singers is much vaster and more varied than even the most impressive bird repertoire. 2 Underlying all avian vocal activity is the syrinx, an organ unique to birds that is located at the first major branching of the windpipe and is linked to the brain. There are general parallels between the syrinx in birds and the larynx in humans. Both produce sound when air is forced through the windpipe, causing thin membranes to vibrate. However, compared to the human larynx, which uses only about two percent of exhaled air, the syrinx is a far more efficient sound-producing mechanism that can create sound from nearly all the air passing through it. 3 Possibly the most interesting aspect of bird song from the perspective of human intelligence is its foundation in the central nervous system. Like humans, birds have large brains relative to their body size. Song is a complex activity that young birds must learn, and learning implies that higher-brain activity must be complex in the control of song. This control is associated with two song-control centers in the avian brain. If the links between these centers and the syrinx are interrupted, a bird is unable to produce normal song. Moreover, bird song is one of the few instances in the animal kingdom of a skill that is lateralized; the song- control centers are located in the left side of the avian brain. A lesion there will destroy bird song, while a similar lesion in the right half of the brain will result in much less damage.

单选题Listentoaconversationbetweentwostudents.Nowgetreadytoanswerthequestions.Youmayuseyournotestohelpyouanswer.Listenagaintopartoftheconversation.Thenanswerthequestion.