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
People, especially teens, think it __ great fun to surf on _____ Internet.
#34030
A
a; the
B
a; 不填
C
不填; the
D
不填；不填
How_____interesting the book is! I do want to read it_____second time.
#32429
A
an;the
B
/;a
C
an;a
D
/;the
The First Huaguoshan International Golf Open was __________ success that we enjoyed ourselves very much.
#33968
A
such a great
B
a such great
C
so a great
D
a so great