请教CXD-assumption-1，10

joywzy

1。The sense of delayed gratification, of working now for later pleasure, has helped shape the economic behaviro of our society. However, that sense is no longer nurtured as consistently in our children as it once was. For example. it used to take a bit of patiene to put together the toys that children got in cereal boxes; now the boys come fromthe boxes whole.

assumption:

C, The boy that used to come in cereal boxes were put together by the same children who played with them.

D. Part of the pleasure of any toy lies in putting the toy together before playing with it

答案：C， 我选D。我不明白C为什么是假设？

10. Some doomsayers are warning that long-range warming or cooling trends in weather patterns will drastically reduce grain production. More optimistic reports, however, point out that, even if such drifts in average temperature do occure, we should expect little change in grain production because there is little evidence that damages in rainfall patterns will occure.Moreover, for most crops, climate-nduced yield trends will be masked by both the year-to-year fluctuation of yields and by the enhancement o fyields because of technological features.

assumption:

B The growing of grain is so highly dependent on technological  factors that improvements in yield are unlikely , regardless of climatic conditions.

D. Long-range warming or cooling trends are more damaging to grain production of they are accompanies by changes in rainfall patterns if they are not.

答案要：D， 我选B，不明白为什么D是假设？

谢谢。

cranberry

1' i agree with d

2,文中指出长期变暖或变冷对农作物的影响不大，因为降水可能不变，另外，天气导致的产量变化被年与年之间的产量变化和技术进步导致的产量增加所演示。
降水看来是影响产量的关键，其它的因素只是掩饰了变化而不是影响了变化

joywzy

以下是引用cranberry在2003-5-11 21:03:00的发言：
1'

2,文中指出长期变暖或变冷对农作物的影响不大，因为降水可能不变，另外，天气导致的产量变化被年与年之间的产量变化和技术进步导致的产量增加所演示。
降水看来是影响产量的关键，其它的因素只是掩饰了变化而不是影响了变化

还是不明白啊， 能再讲讲吗？谢谢。

mindfree

1. C 此题教难,主要是阅读. 原文说先工作在享受是一种普遍的行为, 但是现在对儿童并不再鼓励这种行为, 举例为:以前cereal box里的玩具是要花时间装好的, 现在这些玩具来的时候已经组装好了.

这里的隐含意思是儿童在组装玩具是"work now", 然后是"for later pleasure", 这里的assumption就是:是这些儿童组装的玩具. 既C.

D错在原文中没有说组装本身并有pleasure.

2. D 原文有几个概念都对yield有影响, 先说的是drifts in temp.(A), 然后是damage in rainfall(B), fluctuation (C)and technology(D). 你要注意这几个概念分别对yield的作用. 首先说A会造成影响,又说因为没有B,yield不会有影响. 然后C和D也masked climate-induced fluctuation. 读懂了意思, D就是答案, 既changes in rainfall是个关键因素.

B错在"improvements in yield are unlikely". 这一句话就可以排除B. 因为原文并没有提到improvement in yield, 而只是reduce production.

braveMBA

1. 如果NOT C，意味着以前的孩子和现在是一样的，都是直接玩完整的玩具，因此WEAKEN了文章的举例对结论的支持，NOT WEAKEN，所以是假设；D我觉得错在PART和ANY上，ANY太绝对，有些过分，不象是必要条件，而PART又太模糊的意思。你加个NOT试试，看有WEAKEN的感觉吗？
2. 注意结论，其实结论是说长期变化和科技因素会一定程度地抵消降雨形式的变化，说明降雨形式的变化很厉害，只是被MASKED了，但是还是存在，而且很厉害，所以。。。

cranberry

1' 把toy 看成 boy 所以觉得C 不通，呵呵，D 的问题在于和文章的理念不符，按文章表述的意思，先辛苦后享受，那么开始组装玩具的过程只能是一种辛苦而不是一种快乐。

2，按文中的意思，如果温度的变化产生了，也不一定会影响产量，因为降水的结构可能不随之变化。换言，如果降水的结构随之变化了，则应该对产量产生大的影响。

joywzy

明白了,谢谢!!!