天哪，为什么我下载的gwd跟大家都不一样呢

我也是在cd上下载的gwd 01－15 和16－31啊

我刚开始做第一套，有两道题弄不明白，可是上来一看大家第一套的题目跟我的都不一样

这是怎么回事啊？

比如我的gwd第一套第30题是

The quality of unrefined olive oil is not actually defined in terms of acidity, yet extensive tests have shown that the less free oleic acid an unrefined olive oil contains per liter, the higher its quality.  The proportion of free oleic acid that an olive oil contains is an accurate measure of the oil’s acidity.

If the statements above are all true, which of the following conclusions is best supported by them ?

1. When an olive oil is refined, the concentration of oleic acid in the oil is reduced.
2. The quality of an unrefined olive oil can be determined only by accurately measuring its acidity.
3. If an unrefined olive oil is intermediate in acidity between two other unrefined olive oils, it will also be intermediate between them in quality.
4. Free oleic acid is the only acid that unrefined olive oil contains.
5. People who judge the quality of unrefined olive oils actually judge those oils by their acidity, which the judges can taste.

可讨论区的30题是关于什么传染病的一道题，另外版上其他童鞋第一套题里的内容跟我也不一样，这是怎么回事啊，有没有nn帮我看看，万分感谢拉

另外这道题的答案为什么是B，不是d呢，都说了acidity跟quality的关系没有被define的啊，如果B对，岂不是c和e都对了？

还有我的第40题，

Insect infestations in certain cotton-growing regions of the world have caused dramatic increases in the price of cotton on the world market.  By contrast, the price of soybeans has long remained stable.  Knowing that cotton plants mature quickly, many soybean growers in Ortovia plan to cease growing soybeans and begin raising cotton instead, thereby taking advantage of the high price of cotton to increase their income significantly, at least over the next several years.

Which of the following, if true, most seriously weakens the plan’s chances for success?

1. The cost of raising soybeans has increased significantly over the past several years and is expected to continue to climb.
2. Tests of a newly developed, inexpensive pesticide have shown it to be both environmentally safe and effective against the insects that have infested cotton crops.
3. In the past several years, there has been no sharp increase in the demand for cotton and for goods made out of cotton.
4. Few consumers would be willing to pay significantly higher prices for cotton goods than they are now paying.
5. The species of insect that has infested cotton plants has never been known to attack soybean plants.

怎么都想不通答案会是b而不是c

谢谢各位拉