正确答案: E

脑脊液中的H+

题目：中枢化学感受器最敏感的直接刺激物是（　　）

解析：略

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学习资料的答案和解析：

[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?

physical changes in the human body

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

disregard

[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的。③对于各种不正确的治学方法，我们都要注意 。

特别 增殖 防止

解析：本题考查正确使用词语的能力。“特别”有几个义项：与众不同，不普通；格外，非常；特地；尤其。“格外”有两个义项：副词，表示超过寻常；额外，另外。①句“唯独对他的爸爸不尊重”应加一个强调程度的副词，而“格外”一般情况是指好的方面，所以应选用“特别”。“增殖”原指繁殖，引申为投入产生效益，强调收益生成的过程；“增值”指资产价值增加，强调价值增加的结果。②句“资本的转换和……过程中”，显然应选“增殖”。“防止”指预先设法制止(坏事发生)，有避免之意；“制止”指强迫使停止。③句想表达的意思是避免用不正确的治学方法，而无“强迫使停止”之意。

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

learning, forgetting

[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（　　）

[单选题]肺泡回缩力主要来自（　　）

肺泡表面液体分子层

[单选题]止于下颌颈的肌是（　　）

翼外肌