---Do you know girl over there?-Yes. She is exchange student from America.A. the; aB. a

问题补充：

---Do you know girl over there?

---Yes. She is exchange student from America.

A. the; a

B. a; the

C. the; an

D. an; the

答案：

A. the; a

B. a; the

(答案→)C. the; an

D. an; the

解析：句意：--你知道那边的女孩吗？--是的，她是来自美国的交换生。第一空根据over there可知这里表示特指；第二空这里表示泛指。Exchange是以元音音素开头的单词，所以应该用an;故选C。