have 2 questions

jones79

Whales originated in the freshwater lakes and rivers of ancient Asia about sixty million years ago. Not until about ten millions later did species of whales develop specialized kidneys enabling them to drink salt water. Although fossil evidence shows that some early whale species that lacked such kidneys sometimes swam in the Earth’s saltwater oceans, these species must have had to return frequently to freshwater rivers to drink.

Which of the following is moist strongly supported by the information given?

A, Fossils of whale species dating from between sixty million and fifty million years ago will not be found on continents that were at the time separated from ancient Asia by wide expanses of ocean.

B, Among whale fossils that date from later than about fifty million years ago, none are fossils of whale species that drank only fresh water.

答案是a,觉得b也没错,请帮忙解答.

2. Plant scientists have been able to genetically engineer vegetable seeds to produce crops that are highly resistant to insect damage. Although these seeds currently cost more than conventional seeds, their costs is likely to decline. Moreover, farmer planting them can use far less pesticide, and most consumers prefer vegetables grown with less pesticide. Therefore, for crops for which these seeds can be developed, their use is likely to become to norm.

A, Whether plant scientists have developed insect-resistant seeds for every crop that is currently grown commercially.

B, Whether plants grown from the new genetically engineered seeds can be kept completely free of insect damage.

C, whether farmers typically use agriculture pesticides in larger amounts than is necessary to prevent crop damage

D, Whether seeds genetically engineered to produce insect-resistant crops generate significantly lower per acre crop yields than do currently used seeds

E, Whether most varieties of crops currently grown commercially have greater natural resistance to insect damage than did similar varieties in the past.

答案是d,但我选的是e,弄不懂,请nn指教

babypace

以下是引用jones79在2005-1-6 0:16:00的发言：

Whales originated in the freshwater lakes and rivers of ancient Asia about sixty million years ago. Not until about ten millions later did species of whales develop specialized kidneys enabling them to drink salt water. Although fossil evidence shows that some early whale species that lacked such kidneys sometimes swam in the Earth’s saltwater oceans, these species must have had to return frequently to freshwater rivers to drink.

Which of the following is moist strongly supported by the information given?

A, Fossils of whale species dating from between sixty million and fifty million years ago will not be found on continents that were at the time separated from ancient Asia by wide expanses of ocean.

B, Among whale fossils that date from later than about fifty million years ago, none are fossils of whale species that drank only fresh water.

我觉得A的内容是原文可以告诉我们的，基本上是原文第一句的改写。而B的内容我们无法从原文得到的。原文只说了在5百万年前，开始出现有能代谢盐水的鲸，但没有说从那时候起喝淡水的鲸的化石就没有了。

2. Plant scientists have been able to genetically engineer vegetable seeds to produce crops that are highly resistant to insect damage. Although these seeds currently cost more than conventional seeds, their costs is likely to decline. Moreover, farmer planting them can use far less pesticide, and most consumers prefer vegetables grown with less pesticide. Therefore, for crops for which these seeds can be developed, their use is likely to become to norm.

A, Whether plant scientists have developed insect-resistant seeds for every crop that is currently grown commercially.

B, Whether plants grown from the new genetically engineered seeds can be kept completely free of insect damage.

C, whether farmers typically use agriculture pesticides in larger amounts than is necessary to prevent crop damage

D, Whether seeds genetically engineered to produce insect-resistant crops generate significantly lower per acre crop yields than do currently used seeds

E, Whether most varieties of crops currently grown commercially have greater natural resistance to insect damage than did similar varieties in the past.

这题问的什么问题，你原题的问题没有贴全。

jones79

sorry, question2 is:

which of the following would be most useful to know in evaluating the argument above

jones79

thanks for cracking question1,can someone help me to solve question2

cakemouse

我的理解是:原题中讲:因为有多个因素都在有利方向,所以这种种子就要更普遍使用. 问题是:在评价更广阔使用时还要考虑的因素有哪些.我觉得其它选项都是原文中提过且成立的.而D是可能存在且如果存在时就也需要考虑的因素.

好象没说请楚.