(work) up a sweat, can also help. Also important [35]_______
good health is a good night's sleep.
the
to work
to
Cardiovascular disease [36]______________
(cause) by disorders of the heart and blood vessels(血管). It includes heart attacks, strokes(中风) and high blood pressure. The World Health Organization says there are three major causes: tobacco use, physical inactivity and an [37]__________(health) diet.
is caused
unhealthy
The W.H.O. says cardiovascular disease is the world's [38]_________(lead) cause of death. And it is predicted to remain that way [39]_________
more action is taken. Experts estimate that it could kill 20 million people a year by 2015. An estimated 17.5 million people died in the year 2005. Around 80 percent of [40]_________ died in low- and middle-income countries.
leading
unless
them
(76)
The heart is a complex organ that starts beating a few weeks after pregnancy. At this point the heart is a tube. In the [31]_______ (come) days, it grows and bends into the shape of the heart.
Later, it divides [32]_______ four parts. [33]____ the heart beats, it pumps blood through these chambers and the blood vessels in the body. The body [34]_______________ (estimate) to have at least 96,000 kilometers of blood vessels.
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