问题描述：
—What's this?—It is ___________.[ ] A.an U
—What's this?
—It is ___________.
[ ]
A.an UFO
B.a orange
C.ruler
D.an ID card
—What's this?
—It is ___________.
[ ]
A.an UFO
B.a orange
C.ruler
D.an ID card
问题解答：
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