单项选择题A.The weekend has decreased in length.B.The number of national holidays has increased.C.People work fewer days per week.D.People work more hours each day.
单项选择题A.Research shows that most people are carrying a gene that allows the body to break down caffeine quickly.B.Research shows that even some people have faster gene, they should limit the cups of coffee each day.C.Drinking coffee will only do harm to people’s health.D.People who have a slower gene should not drink coffee more than three cups a day.