[判断题]通过电化区段平交道口车辆装载高度超过2米的货物上，严禁坐人。（ ）
A.正确
B.错误

Why do men die earlier than women The latest research makes it known that the reason could be that men’s hearts go into rapid decline when they reach middle age.
The largest study of the effects of ageing on the heart has found that women’s longevity may be linked to the fact that their hearts do not lose their pumping power with age.
"We have found that the power of .the male heart falls by 20--25 percent between 18 and 70 years of age," said the head of the study, I)avid Goldspink of Liverpool John Moores University in the UK.
"Within the heart there are millions of cells that enable it to beat. Between the age of 20 and 70, one third of those cells die and are not replaced in men," said Goldspink. "This is part of the ageing process."
What surprises scientists is that the female heart sees very little loss of these cells. A healthy 70-year-old woman’s heart could perform almost as well as a
A. the reason why ageing takes a greater loss on the male heart has been found out.
B. scientists are on the way to finding out why the male heart loses more of the cells
C. woman don't need regular exercise.
D. women over 70 could lose much more heart cells than those at the age of 20