下列选项中，含有相同元素的一组化合物是（）
A.纤维素和尿素
B.脂肪酸和磷脂
C.三磷酸腺苷和核糖核酸
D.胆固醇和血红蛋白
参考答案：C
—What's the matter with Tina?
—_______________. [ ]
A. She is away.
B. She is cool.
C. She has a sore throat.
D. She should take some medicine.
