---What did Miss Liu want to know?

---She wanted to know___.

A．where did the other students go?

B．that her students could come back.

C．what her students have done during the trip?

D．if her students were hurt in the accident.

下列关于乳中碳水化合物的描述，错误的是（）。

A.主要为乳糖，含量约占4.6%

B.乳糖促进婴儿肠道内双歧杆菌的生长，对婴儿肠道健康有重要意义

C.乳糖不耐症多为继发

D.乳糖不耐症在婴儿时期就有发生