영어 스낵 모의고사

Enabling animals to is an almost universal function of experience. Most animals innately avoid objects they have not previously encountered. Unfamiliar objects may be dangerous; treating them with caution has survival value. If persisted in, however, such careful behavior could interfere with feeding and other necessary activities to the extent that the benefit of caution would be lost. A turtle that withdraws into its shell at every puff of wind or whenever a cloud casts a shadow would never win races, not even with a lazy rabbit. To overcome this problem, almost all animals habituate to safe stimuli that occur frequently. Confronted by a strange object, an inexperienced animal may freeze or attempt to hide, but if nothing unpleasant happens, sooner or later it will continue its activity. The possibility also exists that an unfamiliar object may be useful, so if it poses no immediate threat, a closer inspection may be worthwhile.

Genetic engineering followed by cloning to distribute many identical animals or plants is sometimes seen as a threat to the diversity of nature. However, humans have been replacing diverse natural habitats with artificial monoculture for millennia. Most natural habitats in the advanced nations have already been replaced with some form of artificial environment based on mass production or repetition. The real threat to biodiversity is surely the need to convert ever more of our planet into production zones to feed the ever-increasing human population. The cloning and transgenic alteration of domestic animals makes little difference to the overall situation. Conversely, the renewed interest in genetics has led to a growing awareness that there are many wild plants and animals with interesting or useful genetic properties that could be used for a variety of as-yet-unknown purposes. This has led in turn to a realization that because they may harbor tomorrow’s drugs against cancer, malaria, or obesity.

(A) Marc wondered whether the birds in line were more fearful because they didn’t know what their flockmates were doing. Emotional contagion would have been impossible for individual grosbeaks in the linear array except with their nearest neighbors.

(B) In a long-term research project that Marc did with some of his students on patterns of antipredatory scanning by western evening grosbeaks, they found that birds in a circle showed more coordination in scanning than did birds who were feeding in a line.

(C) The birds in a line, who could only see their nearest neighbor, not only were less coordinated when scanning, but also were more nervous, changing their body and head positions significantly more than grosbeaks in a circle, where it was possible for each grosbeak to see every other grosbeak. [3점]