Thehumanbodyfeelscomfortablewhenthehumidityisabout（）
A. 40%-60%
B. 50%-60%
C. 30%-60%
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Wheninflight,apilotsuddenlybecomesratherexcitedandpleased,whilehisoperationandjudgmentcapabilitiesdecrease,inthiscase,thepilotmay（）
A. beinhypoxiastate.
B. sufferhyperventilation.
C. betooexcitedbecauseofhappythings.
Ahyperventilationprogressesapilotcanexperience（）
A. Heightenedawarenessandfeelingofwell-being.
B. Decreasedbreathingrateanddepth.
C. Symptomsofsuffocationanddrowsiness.
Whichisacommonsymptomofhyperventilation?（）
A. Drowsiness.
B. Decreasedbreathingrate.
C. Euphoriasenseofwell-being.
Whichwouldmostlikelyresultinhyperventilation?（）
A. Insufficientcarbondioxide.
B. Insufficientoxygen.
C. Excessivecarbonmonoxide.
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