This is 3-D printer. And this is an artificial (人工的) ear. Can you believe that scientists printed this artificial ear by this 3-D printer?
#33175
A
a
B
an
C
the
D
/
推荐题目
--- Do you know ________ girl in pink on the playground? --- Oh, yes, she is ________ honest student. She is my best friend.
#32729
A
the; an
B
the; a
C
a; an
D
the; the
Rush Hour is______ action movie, and_______ story（故事） happened（发生） in America.
#33670
A
a, the
B
the, a
C
an, a
D
an, the