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看板GRE (GRE入學考試)作者ShowEye時間15年前 (2010/09/16 16:49)推噓1(1推 0噓 0→)

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ISSUE 182. "The purpose of many advertisements is to make consumers want to buy a product so that they will 'be like' the person in the ad. This practice is effective because it not only sells products but also helps people feel better about themselves." 80. "The video camera provides such an accurate and convincing record of contemporary life that it has become a more important form of documentation than written records." ARGUMENT 128. Scientists studying historical weather patterns have discovered that in the mid-sixth century, Earth suddenly became significantly cooler. Although few historical records survive from that time, some accounts found both in Asia and Europe mention a dimming of the sun and extremely cold temperatures. Either a huge volcanic eruption or a large meteorite colliding with Earth could have created a large dust cloud throughout Earth's atmosphere that would have been capable of blocking enough sunlight to lower global temperatures significantly. A large meteorite collision, however, would probably create a sudden bright flash of light, and no extant historical records of the time mention such a flash. Some surviving Asian historical records of the time, however, mention a loud boom that would be consistent with a volcanic eruption. Therefore, the cooling was probably caused by a volcanic eruption. -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 140.112.7.59