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
Martin was once ________ “problem student”, but now he’s one of ________ top students.
#33575
A
a, a
B
a, the
C
the, a
D
the ,an
--- 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
Jenny goes to school on foot．It takes her about half ____ hour to get there．
#34674
A
an
B
a
C
the
D
(不填)
I have heard of_______ Michael Jackson, but not_______ famous one.
#32865
A
/, a
B
a, the
C
/; the
D
the; a