正确答案: C

is

题目：If law and order__________not preserved，people will notBe able to live a secure life．

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学习资料的答案和解析：

[单选题]下列画横线的句子翻译错误的是（　　）

将军自念，岂尝有所恨乎?莫非曾经做过令人仇恨的事吗?

[单选题]

[单选题]John________ he could improve his exam results, but he did not have enough time to study．

knew how

解析：考时态和连词。根据从句可判断为过去时，排除选项A和B。how表示如何，符合题意。选项C是正确的。【句子大意】约翰知道如何提高考试成绩，就是没有足够的时间学习。

[单选题]Which of the following is the best title of the article?

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?

REM Sleep

[单选题]He seems_______ from this university．

to havegraduated

[单选题]

[单选题]题目暂无。

[多选题]颈动脉窦压力感受器敏感的人，适当压迫后可以出现（　　）

心交感神经传出冲动减少

血压下降

心率减慢

心迷走中枢紧张性增加

窦神经的传入冲动增加

[单选题]支配眼轮匝肌的神经是 （　　）

面神经