中枢化学感受器最敏感的直接刺激物是（　　）

【名词&注释】

表面张力(surface tension)、脑脊液(cerebrospinal fluid)、蛛网膜(arachnoid)、金融界(financial community)、硬膜外隙(epidural space)、与众不同(larruping)、第一位(the first place)、刺激物(irritant)

[单选题]中枢化学感受器最敏感的直接刺激物^(irritant)是（　　）

A. 脑脊液中的C02
B. 血液中的H+
C. 血液中的CO2
D. 脑脊液中的P(O2)降低
E. 脑脊液中的H+

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学习资料：

[单选题]The subject of this passage is ________．

根据以下内容，回答下面的题目。Researchers have found that REM (rapid eye movement) sleep is important to human beings．This type of sleep generally occurs four or five times during one night of sleep lasting five minutes to forty minutes for each occurrence．The deeper a person’s sleep becomes, the longer the periods of rapid eye movement．There are physical charges in the body to show that a person has changed from NREM (non-rapid eye movement) to REM sleep．Breathing becomes faster, the heart rate increases, and, as the name implies, the eyes begin to move quickly．Accompanying these physical changes in the body is a very important characteristic of REM sleep．It is during REM sleep that a person dreams．According to the passage, how often does REM sleep occur in one night?

A. why people sleep
B. the human need for REM sleep
C. the characteristic of REM sleep
D. physical changes in the human body

[单选题]The boy showed complete_________of his parents，advice．

A. disregard
B. ignorance
C. neglect
D. avoidance

[单选题]依次填入横线处的词语，恰当的一组是 （　　）①他对别人都很好，唯独对他的爸爸 不尊重。 ②金融界的人士都应该清楚地知道，在资本的转换和 过程中，人的作用始终是第一位^{(the first place)}的。③对于各种不正确的治学方法，我们都要注意 。

A. 特别 增殖 防止
B. 格外 增殖 制止
C. 特别 增值 制止
D. 格外 增值 防止

[单选题]A person a foreign language must be able to use the foreign language all his own.

A. learning, forgetting
B. who learns, to forget
C. to learn, to forget
D. using, but

[单选题]根据以下选项，回答{TSE}题：A．硬膜外隙B．蛛网膜下隙C．终池D．乙状窦 E．硬膜下隙 {TS}椎管内面骨膜参与围成的是（　　）

A. A

[单选题]肺泡回缩力主要来自（　　）

A. 肺弹性纤维与肺泡表面张力
B. 肺泡表面液体分子层
C. 肺泡表面活性物质与肺弹性纤维
D. 肺弹性纤维
E. 肺泡表面活性物质

[单选题]止于下颌颈的肌是（　　）

A. 翼内肌
B. 咬肌
C. 颞肌
D. 翼外肌
E. 颊肌

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