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【单选题】
设有关系模式 R(U , F) ,其中 U = {X , Y , Z} , F = {XY→Z } ,则 R 的码是A.
X
B.
Y
C.
XY
D.
XZ
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【单选题】听力原文：The ambassador accepted an exclusive interview of our correspondent at the embassy on bilateral relations. Which of the following is true about the ambassador?
A.
He accepted an interview from the only group of the press.
B.
He accepted an interview from our correspondent among other journalists at the embassy.
C.
He accepted an interview from our journalist alone at the embassy.
D.
He accepts interviews only at the embassy.
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【单选题】Exercise 2 Relations between China and Latin America Directions: You’ll hear an interview of three experts. Diego Macera, CEO of Peruvian Institute of Economics will talk about the relations between C...
A.
Peru needs China’s investment in more industries.
B.
Peru wants to export more products to China.
C.
Peru wants China to be its largest trading partner.
D.
Peru wants to attract more Chinese tourists.
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A.
是肾的结构与功能单位
B.
由肾小体和肾小管组成
C.
分为浅表肾单位和髓旁肾单位
D.
与集合管共同行使泌尿功能
E.
两肾有100万个以上的肾单位
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【单选题】Internet Safety Twenty years ago, kids in school had never even heard of the internet. Now, I'll bet you【1】find a single person in your school who hasn't at least heard of it. In fact, many of us use ...
A.
can
B.
can't
C.
will
D.
could
【单选题】“Geili”, ____ popular Chinese Internet buzzword, is now widely accepted by _____ public as an adjective describing something that’s “cool ”.
A.
the, a
B.
a, a
C.
the, the
D.
a, the
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