About half of Chinese adults sleep less than eight hours every night, a new report said. The report was based on a survey of 6,168 people aged 18 to 70 from July to November last year (2022). 

People with lower level of education have less sleep and lower sleep quality, according to the report. Those with higher level of education may sleep longer and better. 

The report also showed a correlation between a person’s income(收入) and the quality of their sleep. People from families making less than 3,000 yuan ($435) a month get the least amount of sleep and experience the worst sleep quality, the report showed, while those with mid-level incomes sleep longer and generally reported good-quality sleep. For people making more than 10,000 yuan a month, they sleep less than those with mid-level incomes, but they reported a better quality of sleep. 

The report also found that people who exercise often enjoy the best sleep quality, with 85 percent of them saying they have “very good” sleep quality. More than 80 percent said they can fall asleep in less than half an hour, and only 1.8 percent said they have trouble falling asleep.

University students sleep the longest, followed by white-collar workers, blue-collar workers and unemployed(失业的) people. However, university students usually stay up late, which results from the use of phones and computers, over-thinking, stress and their sleeping environments. Sleep is important in improving health and memory. While many university students know that good sleeping habits are conducive to good health, many say they didn’t change their bad habits.

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1.How long did the survey last?

A Four months.

B Five months.

C Six months.

D Seven months.

解析：选B。B数字计算题。根据第一段最后一句的“from July to November”可知，这一调查在2022年7月至11月组织实施，一共五个月。故选B。

2.What influences sleep according to the report? ①Education background. ②Family income. ③Working experience. ④Physical activities.

A ①②③

B ①②④

C ①③④

D ②③④

解析：选B。B细节理解题。文章第二、三、四段分别描述了受教育程度、收入以及体育锻炼对睡眠的影响情况。只有“工作经验”这一项未被提及。故选B。

3.Which of the following people sleep the longest?

A Blue-collar workers.

B University students.

C White-collar workers.

D Jobless workers.

解析：选B。B细节理解题。 根据第五段第一句“University students sleep the longest, followed by white-collar workers, blue-collar workers and unemployed people.”可知，睡眠时间最长的是大学生。故选B。

4.What does the underlined word “conducive” probably mean?

A Helpful.

B Dangerous.

C Easy.

D Difficult.

解析：选A。A词义猜测题。根据划线部分前面的“Sleep is important in improving health and memory.”和后面的“many say they didn’t change their bad habits”可知，睡眠对改善健康状况和增强记忆力很重要，但是尽管很多大学生知道良好的睡眠习惯“有助于”健康，许多人也没有对自己的习惯做出积极的改变。故选A。

5.What is the main purpose of the text?

A To encourage readers to sleep more.

B To tell us the causes of bad sleep.

C To explain the advantages of poor sleep.

D To tell readers the survey results about sleep.

解析：选D。D推理判断题。本文主要呈现了《中国睡眠研究报告2023》所发布的相关内容，因此本文的目的是告诉读者关于睡眠的相关调查结果。故选D。