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【单选题】
建立索引可以加快数据的查询效率。在数据库的三级模式结构中,索引属于A.
内模式
B.
模式
C.
外模式
D.
概念模式
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【单选题】Although the machine is _______, you need to use it correctly and safely.
A.
in peace
B.
in good use
C.
in great need
D.
in good condition
【单选题】Although any destruction of vitamins caused by food irradiation could be______ the use of diet supplements, there may be no protection from carcinogens that some fear might be introduced into foods by...
A.
counterbalanced by
B.
attributed to
C.
inferred from
D.
augmented with
【简答题】Customers are typically______, although residents may also use the landfill.
【简答题】Although some people had an excessive use of the word 'love', the author thought ______.
【单选题】Animals are not born with the capacity to use symbolic communication although some animals such as chimpanzees can be trained to develop certain amount of vocabularies.
A.
Y
B.
N
C.
NG
【单选题】Although measures have been introduced to discourage the use of mobile telephones inside the opera house,______effectiveness remains limited.
A.
they
B.
their
C.
them
D.
theirs
【单选题】患者女，24岁，近期流鼻涕，不愿打喷嚏，有时感觉呼吸困难，诊断为过敏性鼻炎。下列免疫球蛋白中会升高的是
A.
IgA
B.
IgG
C.
IgE
D.
IgM
E.
IgD
【单选题】Although diverse, African music has certain distinctive traits, one of which is the use of repetition as an organizing principle.
A.
benefits
B.
features
C.
notions
D.
options
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