各位要参加2020年GMAT考试的小伙伴们注意啦！今天帮考网要给各位小伙伴分享2020年GMAT考试《GMAT数学》的章节练习，感兴趣的小伙伴赶快来看看哦！

1、Normally, the pineal gland governs a person’s sleep-wake cycle by secreting melatonin in response to the daily cycle of light and darkness as detected by the eye. Nonetheless, many people who are totally blind due to lesions in the visual cortex of the brain easily maintain a 24-hour sleep-wake cycle. So the neural pathway by which the pineal gland receives information from the eye probably does not pass through the visual cortex.

For purposes of evaluating the argument it would be most useful to establish which of the following?

(A) Whether melatonin supplements help people who have difficulty maintaining a 24-hour sleep cycle to establish such a pattern

(B) Whether the melatonin levels of most totally blind people who successfully maintain a 24-hour sleep-wake cycle change in response to changes in exposure to light and darkness

(C) Whether melatonin is the only substance secreted by the pineal gland

(D) Whether most people who do not have a 24-hour sleep-wake cycle nevertheless have a cycle of consistent duration

(E) Whether there are any people with normal vision whose melatonin levels respond abnormally to periods of light and darkness

题目类型：

evaluate the argument

题目翻译：

通常，PG通过分泌M来控制一个人的睡-醒循环，而M是眼睛所探测到的光暗的反应。然而，许多因为大脑视觉皮质受到损伤致盲的人可以很容易地维持24小时的睡-醒循环。所以，从眼睛到PG的神经传导可能不通过大脑的视觉皮质。以下哪一项最有助于评估这段论述的正确性?

解题思路：

无既定思路，逐项分析。

逐项分析：

A、M并非越多越好，补充M有可能导致过量，故无法得出确切结论，排除。

B、正确选项。符合题干主旨。

C、M是不是PG分泌的唯一物质。无关项。

D、没有24小时睡-醒循环的人是不是有他们特定的周期。无关项。

E、对光暗的异常可能有很多原因，不一定是视觉皮质引起的，排除。

正确选项：B

2、Exposure to certain chemicals commonly used in elementary schools as cleaners or pesticides causes allergic reactions in some children. Elementary school nurses in Renston report that the proportion of schoolchildren sent to them for treatment of allergic reactions to those chemicals has increased significantly over the past ten years. Therefore, either Renston’s schoolchildren have been exposed to greater quantities of the chemicals, or they are more sensitive to them than schoolchildren were ten years ago.

Which of the following is an assumption on which the argument depends?

(A) The number of school nurses employed by Renston’s elementary schools has not decreased over the past ten years.

(B) Children who are allergic to the chemicals are no more likely than other children to have allergies to other substances.

(C) Children who have allergic reactions to the chemicals are not more likely to be sent to a school nurse now than they were ten years ago.

(D) The chemicals are not commonly used as cleaners or pesticides in houses and apartment buildings in Renston.

(E) Children attending elementary school do not make up a larger proportion of Renston’s population now than they did ten years ago.

题目类型：assumption

题目翻译：

洗衣剂或杀虫剂等小学常用的化学制品会让孩子有过敏反应。R地的小学护士报告说，在过去的10年中，来到他们那里治疗上述过敏的孩子增加了很多。因此，要么R地的学生现在更多地接触了化学制品，要么学生们比10年前对化学制品更加敏感。

解题思路：

有可能是上学的学生在增加，其实过敏比例没有变。

逐项分析：

A、护士减少了。如果题干里说每一个护士报告的过敏学生数在增加，那么此项成为正确选项，但题干说的是所有护士。排除。

B、对化学制品过敏的学生并不比其他学生更容易对其他东西过敏。无关项。

C、正确选项。过去学生发生过敏反应的时候可能不一定会去学校护士那里，但现在去了，所以护士报告病例增加。

D、化学制品并没有在家里和公寓里被广泛当作洗衣剂或杀虫剂使用。无关项。

E、如果这个是事实的话，那么报告的过敏病例应该持平或下降。

正确选项：C

好了，以上就是2020年GMAT考试《GMAT数学》章节练习（3）的全部内容了，如果各位小伙伴还有不明白的地方，可以进入帮考网咨询了解哦！