二.单项选择题.(15分)
( ) 1.--Is this a pen? --Yes,___________.
A. this is B. it is. C. he is. D. it isn’t.
( ) 2.--This is _______eraser. That is _______ dictionary.
A. a, an B. an, an. C. an, a. D. a, a.
( ) 1.--Is this a pen? --Yes,___________.
A. this is B. it is. C. he is. D. it isn’t.
( ) 2.--This is _______eraser. That is _______ dictionary.
A. a, an B. an, an. C. an, a. D. a, a.