3道我错了的题，其中有一道比较难

1.Oxygen-18 is heavier-than-normal isotope of oxygen.In a rain cloud,water molecules containing oxygen-18 are rarer than water molecules containing mormal oxygen.But in rainfall,a higher proportion of all water molecules containing oxygen-18 than of all water molecules containing ordinary oxygen descended to earth.Consequently,scientists were surprised when measurements along the entire route of rain clouds passage from above the Atlantic Ocean,the site of their originated formation,across the Amazon forests,where it rains almost daily,showed that oxygen-18 content of each of the clouds remained fairly constant.

(1)which one of the following statements,if true best helps to resolve the conflict between scientists' expectations based on the known behavior of o-18,and the results of their measurements of the rain clouds o-18 content

A.Rain clouds above tropical forests are poorer in o-18 than rain clouds above unforested regions.

B.Like the oceans,tropical rain forests can create or replenish rain clouds in the atmosphere above them

C.The amount of the rainfall over the Amazon rain forests is exactly the same as the amount of rain originally collected in the clouds formed above the Atlantic Ocean.

D.The amount of rain recycled back into the atmosphere from the levels of forest vegetation is exactly the same as the amount of rain in river runoffs that is not recycled into the atmosphere

E.Oxygen-18 is not a good indicator of the effect of tropical rain forests on the atmosphere above them

(2)Which of the following inferences about an individual rain cloud is supported by the passage

A.Once it is formed over the Atlantic,the rain cloud contains more ordinary oxygen than oxygen-18

B.Once it has passed over the Amazon,the rain cloud contains a greater-than-normal percentage of oxygen-18

C.The cloud's rainfall contains more oxygen-18 than ordinary oxygen

D.During a rainfall,the cloud must surrender the same percentage of its ordinary oxygen as of its oxygen-18

E.During a rainfall,the cloud must surrender more of its oxygen  than it retains

2.It is very difficult to prove today that a painting done two or three hundred years ago,especially one without a signature or with a questionably authentic signature,is indubitably the work of this or that particular artist.This fact gives the traditional attribution of a disputed painting  special weight,since that attribution carries the presumption of historical continuity.Consequently,an art historian arguing for a deattribution will generally convince other art historians only if he or she can persuasively argue for a specific reattribution.

Which of the following ,if true,most stronly suports the postion that the traditional attribution of a disputed painting should not have special weight

A.Art dealers have always been led by economic self-interest to attribute any unsigned painting of merit to recognized masters rather than to obscure artists

B.When a painting is originally created,there are invariably at least some eyewitnesses who see the artist at work,and thus the questions of correct attribution cannot arise at that time

C.There are not always clearly discernible difference between the occasional inferior work produced by a master and the very best work produced by a lesser talent

D.Attribution can shape perception in as much as certain features that would count as marks of greatness in a master's work would be counted as signs of inferior artistry if a work were attributed to a minor artist

E.Even though some masters had specialists assist them with certain detail work,such as depicting lace,the resulting works are properly attributed to the masters alone

3 In M sales of classical records are soaring.The buyers responsible for this boom are quite new to classical music and were drawn to ti either by classical scores from television commercials or by theme tunes introducing major sports events on television.Audiences at classical concerts,however,are continually shrinking in M.It can be concluded from this that the new M converts to classical music,having initially experienced this music as recorded music,are most comfortable with classical music as recorded music and really have no desire to hear live performances

The argument assumes which of the following

A.To sell well in M,a classical record must include at least one piece familiar from television

B.At least some of the new M buyers of classical records have available to them the option of attending classical concerts.

C.The number of classical records performed in M has not decreased in reponse to smaller audiences

D.The classical records available in M are,for the most part,not recordings of actual public concerts.

E.Classical records in M are not limited to music that is readily available on

1.(1)答案是B。我选的是D，也有人选C，到现在也没明白是什么意思，哪位高手给解释一下

1（2）答案是A。这道题其实是很简单的，我看了A就选拉，但我又往下看了其他选项，就改成了D。A是从第二句得出的，但D是为什么错了呢

2 答案是A。我选的是D。原文就是要否定attribution不值得给予特殊重视，D说明其缺陷不就说明这点了吗，A是说art dealers进行attribution时参与其他因素，并没有否定attribution本身的作用啊

3.答案是C。这道题其实很简单。采用NOT+WEAKEN就解决，但是我不知道为什么B错了