B．Ignore（忽视） unpleasantness and stick to your tasks.

C．Always be kind an hard-working

D．Do things quickly so as to be ready for the next.

B

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 obviously 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 obviously got more sleep than those in the other three states