单项选择题

People born in autumn live longer than those born in spring and are (31) likely .to fall chronically iii when they are older, according to an Austrian scientist. Using (32) data for more than one million people in Austria, Denmark and Australia, scientists at the Max Planck Institute (33) Demographic Research in the northern German town of Restock found the month of birth was (34) life expectancy over the age of 50. (35) differences differences in what mothers ate during (36) ,and infections (37) at different times of the year could both have an impact on the (38) of a newborn baby and could (39) its life expectancy in older age. "A mother giving birth in spring spends the last (40) of her pregnancy in (41) , (42) she will eat less vitamins than in summer," said Gabriele Doblhammer, one of a team of scientists who (43) the research. "When she stops (44) and starts giving her baby normal food, it’s in the hot weeks of summer when babies are (45) to infections of the digestive (46) ." In Austria, adults born in autumn (October-December) lived about seven months longer than those born in spring (April-June), and in Denmark adults with birthdays in autumn (47) those born in spring about four months. In the southern hemisphere, the picture was similar. Adults born in the Australian autumn—the European spring-lived about four months longer than those born in the Australian spring. The study focused on people born at the be- ginning of the 20th century, using (48) certificates and census data. Although (49) at all times of the year has improved since then, the seasonal pattern (50) , Dobl-hammer said.