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【单选题】
要保证数据库的逻辑独立性,需要修改的是()A.
模式与外模式的映射
B.
模式与内模式的映射
C.
模式
D.
三层模式
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举一反三
【单选题】—Why do you suggest the West Lake? —I believe __beauty of nature there will make __excellent impression upon you.
A.
the; the
B.
the; /
C.
a; an
D.
the; an
【单选题】To get promoted, one must not only be competent but ______.
A.
give his boss a good impression
B.
honest and loyal to his company
C.
get along well with his colleagues
D.
avoid being too outstanding
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