A new study released（发布） by the Center for Disease Control （CDC） indicates that adults in US are not getting enough rest each night, according to media reports Friday.

       Of those questioned, 70 percent said they had not gotten enough rest or sleep every day of the past month.

       The study, which surveyed adults in Delaware, Hawaii, New York and Rhode Island, found that a lack of sleep is a particular problem for younger adults.

       Of those between 18 and 34, 13.3 percent lacked enough sleep every day, compared to 7.3 percent of adults over 55.

       However, the study did not find much difference between races or sexes.

       The National Sleep Foundation says that most adults need 7 to 9 hours of sleep every night.

       An estimated （评估的） 50 to 70 million people suffer from constant sleep loss or sleep disorders, according to CDC, though people often do not understand that lack of sleep can cause health problems.

       But there is some good news: retirement is apparently good for your sleep habits. The CDC found that those who are no longer working are twice as likely to report that they get a full night’s sleep.

       Sleep patterns can be influenced by what kinds of jobs people have, and even where they live. People who lived in Hawaii apparently got more sleep than those in the other three states studied, the study found, Lifestyle choices, such as late-night television watching, Internet surfing, or caffeine intake（咖啡因摄入）, can also affect sleep patterns, the study said.

1．Which of the following is not the cause of one’s sleep loss according to the study?

     A．Where one lives.                       B．One’s lifestyle choices.

       C．The difference in age.                       D．Races and sexes.

2．Which of the statements is true based on the above passage?

     A．The lack of sleep can cause health problems.

       B．Retired people have more problems with sleep.

       C．One’s job does not affect one’s sleep.

       D．70 percent of the people in the surveyed states lack sleep.

3．How many factors mentioned in the passage affect people’s sleep patterns?

       A．2．             B．3．                  C．4．                  D．5．

       A new study released（发布） by the Center for Disease Control （CDC） indicates that adults in US are not getting enough rest each night, according to media reports Friday.

       Of those questioned, 70 percent said they had not gotten enough rest or sleep every day of the past month.

       The study, which surveyed adults in Delaware, Hawaii, New York and Rhode Island, found that a lack of sleep is a particular problem for younger adults.

       Of those between 18 and 34, 13.3 percent lacked enough sleep every day, compared to 7.3 percent of adults over 55.

       However, the study did not find much difference between races or sexes.

       The National Sleep Foundation says that most adults need 7 to 9 hours of sleep every night.

       An estimated （评估的） 50 to 70 million people suffer from constant sleep loss or sleep disorders, according to CDC, though people often do not understand that lack of sleep can cause health problems.

       But there is some good news: retirement is apparently good for your sleep habits. The CDC found that those who are no longer working are twice as likely to report that they get a full night’s sleep.

       Sleep patterns can be influenced by what kinds of jobs people have, and even where they live. People who lived in Hawaii apparently got more sleep than those in the other three states studied, the study found, Lifestyle choices, such as late-night television watching, Internet surfing, or caffeine intake（咖啡因摄入）, can also affect sleep patterns, the study said.

1．Which of the following is not the cause of one’s sleep loss according to the study?

     A．Where one lives.                       B．One’s lifestyle choices.

       C．The difference in age.                       D．Races and sexes.

2．Which of the statements is true based on the above passage?

     A．The lack of sleep can cause health problems.

       B．Retired people have more problems with sleep.

       C．One’s job does not affect one’s sleep.

       D．70 percent of the people in the surveyed states lack sleep.

3．How many factors mentioned in the passage affect people’s sleep patterns?

       A．2.              B．3.      C．4.          D．5.