Six-year-old Maria is waiting in line at Santo Domingo airport. She is leaving her motherland to join her sister in America. From these two sentences, we can see that Maria is still in Santo Domingo, not in the United States, so we choose D.

She suddenly heard an airline employee ask her to pick up her luggage and put it on the scale. It can be seen from this sentence that "airline employees" means "checking people's luggage", not just "picking up luggage", so we choose C.

C, this question is very simple, upset corresponds to unhappy.

D, "Everyone looked at him disapprovingly" translates as everyone looked at him disapprovingly, which corresponds to "I'm sorry for that man's behavior". The test point is whether you know the words disapproval and politeness.

She is young, but she behaves well. Young as she is, she is smart and sensible. Other options do not match the meaning of the article.