单选题 (单选题, 2.2 分) Which description of the concept of stress is correct?

A、 It describes the body's response to emergency situations

B、 It describes the idea that the human body copes with stress

C、 It describes the body's response to various demands applied to it

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单选题 (单选题, 2.4 分) At normal temperatures, what is the most comfortable relative humidity range for the human body?

A、 60-80%

B、 40-60%

C、 20-30%

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单选题 (单选题, 2.5 分) What is a common complication of flying with a cold?

A、 Airsickness

B、 Ear swelling and ache

C、 Insufficiency of cerebral blood supply

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单选题 (单选题, 2.4 分) What is the radiation safety limit for aircrew per year?

A、 20 mSv

B、 15 mSv

C、 25 mSv

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单选题 (单选题, 2.4 分) What is the primary function of red blood cells?

A、 To transport oxygen and carbon dioxide

B、 To defend against the spread of pathogens

C、 To promote blood coagulation

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单选题 (单选题, 2.4 分) How does the brain perceive the body's orientation in space?

A、 By combining and comparing visual, vestibular, and postural cues

B、 By processing information from the inner ear

C、 By processing information from the eyes

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单选题 (单选题, 2.4 分) Cones, located at the center of the retina, are sensitive to what?

A、 Strong light and low light

B、 Strong light and color

C、 Low light

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单选题 (单选题, 2.5 分) Which part of the body senses acceleration?

A、

Eyes

B、

Vestibular apparatus

C、

Brain

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单选题 (单选题, 2.4 分) How does blood oxygen saturation vary with an increase in altitude?

A、 Decreases

B、 Increases

C、 Remains unchanged

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