请教两道逻辑题，求XDJM们进来帮忙

kevinh1217

24  The 38 corporations that filed United States income tax returns

showing a net income of more than $100 million accounted for

53  percent of the total  taxable income from foreign sources

reported on all tax returns.  Sixty percent of the total taxable

income from foreign sources came from the  200  returns

reporting income from  10  or more countries.

If the statements above are true, which of the following must

also be true?

A   Most of the total taxable income earned by corporations with

        net income above  $100 million was earned from foreign

        sources.

B  Wealthy individuals with large personal incomes reported

        47 percent of the total  taxable income from foreign sources.

C Income from foreign sources amounted to between  53  and

        60 percent of all reported taxable income.

D   Some of the corporations with net income above  $100  million

        reported income from 10 or more countries.

E  Most of the tax returns showing income from 10  or more

        countries reported net income of more than $100  million.

请问这道题A选项为什么不对？
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A ten-year comparison between the United States and the Soviet Union in terms of crop yields per acre revealed that when only planted acreage is compared, Soviet yields were equal to 68 percent of United States yields. When total agricultural acreage (planted acreage plus fallow acreage) is compared, however, Soviet yield was 114 percent of United States yield.
　　From the information above, which of the following can be most reliably inferred about United States and Soviet agriculture during the ten-year period?
　　A. A higher percentage of total agricultural acreage was fallow in the United States than in the Soviet Union.
　　B. The United States had more fallow acreage than planted acreage.
　　C. Fewer total acres of available agricultural land were fallow in the Soviet Union than in the United States.
　　D. The Soviet Union had more planted acreage than fallow acreage.
　　E. The Soviet Union produced a greater volume of crops than the United States produced.

这道题 C和D为什么不对？

恳请指点！！谢谢

闲人逛逛

第一篇文章的逻辑是38个公司占了xx的58%，而200家回单占了xx的60%   A选项是说：绝大多数收入在$100以上的公司是赚国外钱的  文中没有提到

闲人逛逛

第二个题建议列方程解。。。当然直观感觉也是可以看出来的！我好奇的是第二题答案是什么呀？

kevinh1217

闲人逛逛 发表于 2013-4-8 12:18
第二个题建议列方程解。。。当然直观感觉也是可以看出来的！我好奇的是第二题答案是什么呀？ ...

A，但是不清楚cd为什么不对

真武剑

因为比较的是亩产，所以不可能得到跟总数有关的信息。
A 美国的休耕地的比例比苏联高，正确
C 苏联的休耕地的总数比美国少，未知
至于D，不知道能不能从题目中推出来是正确还是错误，得找张纸算上个十几分钟才行。楼主还是亲自动手吧。

真武剑

另外，这是GMAT的题吗？ 在OG里面没见过这种题目，我觉得有点神似某参考书的风格。

kevinh1217

真武剑 发表于 2013-4-9 02:54
另外，这是GMAT的题吗？ 在OG里面没见过这种题目，我觉得有点神似某参考书的风格。 ...

gre的，黄皮陈向东离得