Long-distance runners may at times worry about their heart healthwhile taking part in the

events. But astudy finds that heat stroke (中暑) fellsmany more runnersthan ____76____ a heart problem. Heat stroke can damage a person’s brain, heart, kidneys and ____77____.

And new data shows the toll it takes. Researchers ____78____ health records frommore than 130,000 runners who competed in long-distance events during a seven-year span.Theanalysis ____79____that distance runners were 10 times more ____80____ to experienceheat stroke thanserious heart problems. All the fatal or life-threatening events were ____81____heat stroke.

The researchersadvise runners to take 10 to 14 days to adjust to the climate ____82____ takinga serious run in a hot region. And they sayrunners should ____83____taking part in the event if they’ve been sick recently.

____84____ one day runners will be installed some internal temperature controller that can keep their body temperature normal. But for now runners should simply ____85____their best to keep cool.

76、_______

A.is

B.has

C.do

D.does

77____A.head

B.arms

C.muscles

D.feet

78____A.explored

B.examined

C.inquired

D.required

79____A.revealed

B.realized

C.reasoned

D.recalled

80____A.possible

B.hardly

C.timely

D.likely

81____A.in

B.of

C.from

D.on

82____A.during

B.before

C.after

D.while

83____A.give up

B.give in

C.give out

D.give away

84____A.However

B.Therefore

C.Hence

D.Perhaps

85____A.make

B.show

C.do

D.work

请帮忙给出每个问题的正确答案和分析，谢谢！