机体的排泄途径有哪些?为什么说肾脏是最主要的排泄器官?
给家兔(体重2.5kg)静脉注射20%的葡萄糖溶液5mL后,尿量有何变化?为什么?
What does the author say boredom can lead to?
A. Determination.
B. Mental deterioration.
Concentration.
D. Harmful conduct.
What is the findings of one team of psychologists in their experiment?
A. Volunteers prefer watching a boring movie to sitting along deliberating.
B. Many volunteers choose to hurt themselves rather than endure boredom.
C. Male volunteers are more immune to the effects of boredom than females.
D. Many volunteers are unable to resist boredom longer than fifteen minuets.
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