【单选题】听力原文:W: It's so hot today that I can't work. I wish there was a fan in the office. M: So do I. I'll fall asleep if I don't get out of this unpleasantly warm room. Q: What are these people complaining ...
【简答题】Exactly why weight loss can vary so much for people on the same diet plan still elude s scientists. “It’s the biggest open question in the field,” says the NIH’s Hall. “I wish I knew the answer.”