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【单选题】
自然光以60°的入射角照射到某两介质交界面时，反射光为完全偏振光，则知折射光应为下列中哪条所述?A.
完全偏振光且折射角是30°
B.
部分偏振光且只是在该光由真空入射到折射率为压的介质时，折射角是30°
C.
部分偏振光，但两种介质的折射率才能确定折射角
D.
部分偏振光且折射角是30°
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【简答题】简述幼儿园美术教育的总目标?
【单选题】---How old is your son?--- ______. We had a special party for his ____ birthday last Sunday.
A.
Nine, ninth
B.
Nine, nine
C.
Ninth, nine
D.
Ninth, ninth
【单选题】The race to attract students with the most modern networks and the hottest systems has reached fever pitch.
A.
fact
B.
opinion
【单选题】—How old is your son? —_____.We had a special party for his _____ birthday last Sunday. [ ]
A.
Ninth; ninth
B.
Nine; nine
C.
Ninth; nine
D.
Nine; ninth
【单选题】— How old is your son? — Five. —We will have a special party for his birthday .
A.
five
B.
fifth
C.
fifteen
D.
fifteenth
【单选题】Could you tell me _________?
A.
how old is your son
B.
that he will come here soon.
C.
whether is it fine tomorrow.
D.
who is going to speak at the meeting
【单选题】—How old is your son?________. We had a special party for his _________ birthday yesterday.
A.
Ninth, nine
B.
Nine, the ninth
C.
Nine, ninth
D.
nine,nine
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