一、单项选择（每小题1分，满分15分）
( ) 1. — Mrs Black’s son is really unusual boy.
— Yes. He became university student when he was 13 years old.
A. a; a B. a; an
C. an; a D. the; the
( ) 2. Picture 3 is different Picture 1, but it is the same Picture 2.
A. from; as B. with; at
C. from; at D. with; as
( ) 3. — Do you know what presents Lucy and Lily will buy for our teacher on Teachers’ Day?
— No. The girls just keep the secret to .
A. ourselves B. themselves
C. herself D. them
