D.Smoke could attack many parts of the body in many ways but many people wouldn’t think so .
64.The gas amount in cigarette smoke is
.
A.640 times higher than the gas safe levels in factories .
B.640 times lower than the gas safe levels in factories
C.640 times as much as that in factories
D.as dangerous as that in factories
65.If you smoke,
.
A.your blood carries more oxygen than is normal
B.your blood carries much more carbon monxide than is normal
C.you can have five to ten times of blood than usual
D.your blood will be poisonous
66.Those who smoke
.
A.all live at sea level
B.don’t live at an altitude of two miles
C.breathe as much oxygen as non-smokers
D.only get the same amount of oxygen at the sea level as non-smokers at an altitude of nearly 2 miles
67.Smokers are
.
A.easily hurt
B.easily excited
C.easily worn out
D.healthy
D
American doctors say that mothers who smoke before their babies are born may slow the growth of their babies’ lungs .They say reduced lung growth could cause the babies to suffer breathing problems and lung disease later in life .Doctors in Boston ,Massachusetts studies 11 000 children .The mothers of some of the children smoked ;the other mothers smoked did not .Fdoctora found that the lungs of the children whose mothers were 8% .less developed than the lungs of the children whose mothers did not smoke ,and that the children whose mothers smoked developed 20% more cold and breathing diseases than other children later in life .
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