dolphins


Recently an unusually high number of dolphins have been found dead of infectious diseases, and most of these had abnormally high tissue concentrations of certain compounds that, even in low concentrations, reduce dolphins’ resistance to infection. The only source of these compounds in the dolphins’ environment is boat paint. Therefore, since dolphins rid their bodies of the compounds rapidly once exposure ceases, their mortality rate should decline rapidly if such boat paints are banned.


Which of the following, if true, most strengthens the argument?

A- The levels of the compounds typically used in boat paints today are lower than they were in boat paints manufactured a decade ago.
B- In high concentrations, the compounds are toxic to many types of marine animals.
C- The compounds break down into harmless substances after a few months of exposure to water or air.
D- High tissue levels of the compounds have recently been found in some marine animals, but there is no record of any of those animals dying in unusually large numbers recently.
E- The compounds do not leach out of the boat paint if the paint is applied exactly in accordance with the manufacturer’s directions.


dolphins death: because of the chemical compounds in the dolphins' environment

Facts: dolphins recovered rapidly once the exposure ceased

If boat paints are banned, mortality decline 

because without boat paint, dolphins recover quickly
if the paint do not leach out, then the dolphin won't decline, which weaken the statement.

评论

发表评论

此博客中的热门博文

The area of literary rights

The area of literary rights is confusing for scholars whose work focuses on collaborative materials particularly materials of earlier Native American writers. Questions arise over authorship and the determination of literary heirs . For example, recognition of heirs turns on the European-based assumption of the private ownership of a written statement. The first person to writer down an oral tale can become legally recognized as the owner of that version of the story, just as the first chemist to patent a tribal healing practice becomes the owner of the resulting chemical formula. This instance on private rather than collective ownership, derived from the nineteenth-century notion of the autonomous, creative, authorial voice, flies in the face of those who come from an oral tradition. Thus a scholar concerned with finding literary heirs in order to afford them the benefits of copyright laws must in so doing accede to legal concept of ownership that has been used to appropriate knowle...
阅读全文

women readers should favor history

     Late-eighteenth-century English cultural authorities seemingly concurred that women readers should favor history, seen as edifying, than fiction, which was regarded as frivolous and reductive. Readers of Marry Ann Hanway’s novel Andrew Stewart, or the Northern Wanderer, learning that its heroine delights in David Hume’s and Edward Gibbon’s histories, could conclude that she was more virtuous and intelligent than her sister, who disdains such reading. Likewise, while the naïve, novel-addicted protagonist of Jane Austen’s Northanger Abbey, Catherine Morland, finds history a chore, the sophisticated, sensible character Eleanor Tilney enjoys it more than she does the Gothic fiction Catherine prefers. Yet in both cases, the praise of history is more double-edged than it might actually appear. Many readers have detected a protofeminist critique of history in Catherine’s protest that she dislikes reading books filled with men “and hardly any women at all.” Hanway, meanwhile...
阅读全文

50D

 还有50天，可是备考状态大不如以前，单词记得慢又少，verbal部分错的多，阅读还是一到长阅读就懵。文学评论和历史还是错误百出，要怎么继续提高，作文也写到麻木，真的能坚持自己最初的想法到最后吗？ 实验进度也慢，不知道自己整天在干嘛，没有提高却每天都很忙，可能需要转换复习的方式，将holostudy转成specific，一项一项慢慢来比较好。 那目前最需要解决的便是verbal部分，reading和tc，tc做的慢，每次到reading都没有时间，继续定时做题，提高做题效率和理解能力，主要还是英文水平不够高，理解不到位且花的时间多。
阅读全文