[单项选择]Passage Three

In recent years there has been an increasing number of large oil spills. These spills, some of which have occurred directly at the site of extraction and others during transportation, have had in adverse effect on marine organisms. Because of the importance of these organisms in the life cycle, research has been carried out in order to identify more accurately the reactions of these organisms to oil. A recent study has revealed that it is essential to understand that there is not one but rather, at least four possible ways in which oil can affect an organism. First, as a result of an organism’s ingestion of oil, direct lethal toxicity (毒性), that is, death by poisoning, can occur. However, in cases where the effect is less extreme, sub-lethal toxicity occurs. While cellular and physiological processes are involved in both cases A. at the site of extraction B. during transportation C. before making use of it D. A＆B 查看答案 更多"Passage Three In recent y"的相关试题: [单项选择]Passage Three In recent years there has been an increasing number of large oil spills. These spills, some of which have occurred directly at the site of extraction and others during transportation, have had in adverse effect on marine organisms. Because of the importance of these organisms in the life cycle, research has been carried out in order to identify more accurately the reactions of these organisms to oil. A recent study has revealed that it is essential to understand that there is not one but rather, at least four possible ways in which oil can affect an organism. First, as a result of an organism’s ingestion of oil, direct lethal toxicity (毒性), that is, death by poisoning, can occur. However, in cases where the effect is less extreme, sub-lethal toxicity occurs. While cellular and physiological processes are involved in both cases A. Marine Organisms. B. Oil Spills. C. The Effect of Oil on Marine Organisms. D. The Study of Oil Spills. 查看答案 [单项选择]Passage Three Three years ago, researchers announced the discovery of human genes that were capable of turning ordinary cells into malignant ones. The news met with some skepticism. Experts asked how a single gene could cause such a dramatic change. Why does cancer take years or even decades to develop if it is caused by such a simple and direct process In last week’s issue of the, three research teams answered those questions by setting forth a new model for understanding the role of oncogenes in cancer. Each group found that it does in fact take more than a single gene to produce cancer in normal cells. Teams at M. I. T and Cold Spring Harbor Laboratory on Long Island, N. Y. , reported that they could induce cancer in normal rat cells only by inserting at least two types of oncogene into the cells. "A single oncogene produced some changes, A. was caused by normal cells B. sometimes resulted from internal actions of the victim’s own body C. was a hereditary disease D. was a form of malignancy 查看答案 [单项选择] Passage Three In recent years, railroads have been combining with each other, merging into super systems, causing heightened concerns about monopoly. As recently as 1995, the top four railroads accounted for under 70 per cent of the total ton-miles moved by rails. Next year, after a series of mergers is completed, just four rail roads will control well over 90 percent of all the freight moved by major rail carriers. Supporters of the new super systems argue that these mergers will allow for substantial cost reductions and better coordinated service. Any threat of monopoly, they argue, is removed by fierce competition from trucks. But many shippers complain that for heavy bulk commodities traveling long distances, such as coal, chemicals, and grain, trucking is too costly and the railroads therefore have them by the throat. The vast consolidation within the rail industry means that most shippers are served by only one rail company. Railroads typicall A. cost reduction is based on competition. B. services call for cross-trade coordination. C. outside competitors will continue to exist. D. shippers will have the railway by the throat. 查看答案 [填空题]Passage Three For years researchers thought that IQ, or fluid intelligence-the ability to solve new problems and reason well-could not be (1) . You had the smarts you were born with, period. No one believed that a few brain exercises, if done often enough, could boost (2) intelligence. A study published in Proceedings of the National Academies of Sciences shatters that dogm a. Researchers ran participants through a (3) of training sessions with a computerized test that was (4) to become harder as the participants’ scores rose and (5) as their scores went down. The task involved observing two streams of stimuli, one heard (spoken consonants) and one seen (spatial locations). The demanding part (6) nothing when the two stimuli matched what had occurred two or even three steps (7) in the sequence. Each participant’s intelligence was (8) before taking the first te 查看答案 我来回答: 提交 最新试题 ●    [判断题]个人房产装修贷款资金必须用于借款人（或其配偶）名下住房或商业房（或租赁商业房）的装修。 ●    [单选题]X素休克治疗精神病，出现低血糖反应的表现为 ●    [判断题]李某扬言实施放火扰乱公共秩序,因其并未真正实施,故李某不应受到治安管理处罚。 ●    [单选题]《变电评价管理规定》各类( )、图纸按专用柜摆放整齐，标志醒目齐全，便于检索。 ●    [单选题]对于绝大多数可燃固体来说，（ ）是评定其火灾危险性的主要标志参数。 ●    药物引起的红斑狼疮，其皮损主要表现为（） 网站地图 我要搜题网  版权所有  ©2024  湘ICP备18016427号   购买搜题卡查看答案 [会员特权] 开通VIP， 查看 全部题目答案 [会员特权] 享免全部广告特权 推荐91天 ¥36.8 ￥80元 31天 ¥20.8 ￥40元 365天 ¥88.8 ￥188元 请选择支付方式 微信支付 支付宝支付 点击支付即表示同意并接受了《购买须知》 立即支付 系统将自动为您注册账号 已有账号登录 找回账号密码 请使用微信扫码支付 订单号： 截图扫码使用小程序[完全免费查看答案] 前往小程序 请不要关闭本页面，支付完成后请点击【支付完成】按钮 支付完成 取消支付 恭喜您，购买搜题卡成功 系统为您生成的账号密码如下： 账号 密码 重要提示：请拍照或截图保存账号密码！ 我要搜题网官网：https://www.woyaosouti.com 我已记住账号密码