[单选题]Which of the following shows that a person is NOT dreaming in his sleep?

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?

正确答案 ：C

His heart rate increases．

[单选题]号码资源使用规范：固话号码和移动号码回收号码需要沉淀（）天后（即号码释放状态天数），系统自动进行回收，不允许人工从沉淀号码中进行回收操作。

正确答案 ：D

D、90天

[单选题]早期鼻咽癌的症状不包括（）

正确答案 ：B

吞咽困难

[单选题]卧位加重，立位减轻的前额部头痛可能是（）

正确答案 ：C

低颅压性头痛

[单选题]乳化液泵的工作压力靠（）保证。

正确答案 ：B

B、卸载阀

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