第5题: [单项选择]A. Iced coffees sold by some popular chains are contaminated. B. Some iced coffees have as many calories as a hot dinner. C. Some brand-name coffees contain harmful substances. D. Drinking coffee after a meal is more likely to cause obesity. 参考答案:B 答案解析:[听力原文] Enjoying an iced coffee Better skip dinner or hit the gym afterwards, with a cancer c
第7题: [单项选择]当毛细血管血液的还原血红蛋白超过下列哪项数值时,皮肤黏膜即可出现发绀() A. 100g/L B. 80g/L C. 60g/L D. 50g/L E. 40g/L 参考答案:D 答案解析:当毛细血管内的还原血红蛋白超过50g/L(5g/dl)时(即血氧未饱和度超过6.5vol/dl),皮肤黏膜可出现发绀。