【单选题】—Young kids shouldn’t go swimming alone. —__________. It’s too dangerous.
【简答题】Young
kids shouldn’t go swimming alone. ____. It’s too erous.A. You’re welcome. B. It
doesn’t matter. C. I agree with you. D. I
don’t think so.
【单选题】合成尿素所需的第二个氮原子由下列哪种氨基酸直接提供?()