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【单选题】
What will be the result of using the SQL> DROP USER SCOTT CASCADE； command？（）A.
The user， Scott， is dropped， all the objects in Scott’s schema are placed in the Recycle Bin， and the objects that are already in the Recycle Bin are dropped.
B.
The user， Scott， is dropped， all the objects in Scott’s schema are placed in the Recycle Bin， and all the objects in the Recycle Bin， belonging to the user Scott， are not dropped.
C.
The user， Scott， is dropped， all the objects in the Scott’s schema are not placed in the Recycle Bin， and the objects in the Recycle Bin， belonging to the user， Scott， are not dropped.
D.
The user， Scott， is dropped， all the objects in Scott’s schema are not placed in the Recycle Bin， and the objects in the Recycle Bin are dropped.
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【单选题】异戊烷和新戊烷互为同分异构体的依据是（）。
A.
具有相似的化学性质
B.
具有相同的物理性质
C.
分子具有相同的空间结构
D.
分子式相同，但分子内碳原子的空间结构不同
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【单选题】—The guard keeps watch at the gate. —So he does. Only those knows well could be let in.
A.
close; who
B.
tight; whom
C.
tight; that
D.
close; he