以下操作会影响体积传质系数的测定数值（）。
A. 将原计划的0.35mol/L亚硫酸钠溶液误用为0.45mol/L亚硫酸钠溶液
B. 滴定时，在滴定液变浅黄色之前加入淀粉指示剂
C. 将相邻两次取样时间间隔10min改变为15min
D. 碘液加入亚硫酸钠溶液时，未贴近液面且加入速度较慢
2. How can cold showers provide a helpful assist in your weight loss plan?
A. Brown fat is to produce heat to keep your body warm.
B. White fat tends to accumulate at your waist, lower back, neck and legs.
Cold temperatures increased the metabolic rate of brown fat, which helps a person reduce weight.
D. White fat is the body fat we all know and struggle to get rid of.
3. According to the passage, which statement is NOT true?
A. If someone turns your shower from hot to cold, you should thank him or her.
B. You can get benefits with a cold shower after doing exercise.
Cold water dries out your skin, while hot water tightens your cuticles and pores.
D. If you feel terrible, you can switch water temperature from hot to cold in a short period.
4. What is the writer's attitude about cold showers?
A. Positive.
B. Doubtful.
C. Negative.
D. Indifferent.
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