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【单选题】
康托尔创立的()理论是实数以至整个微积分理论体系的基础。A.
量子理论
B.
群论
C.
拓扑理论
D.
集合论
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反馈参考答案：
举一反三
【单选题】______ what you intended, I should not have wasted my time trying to explain matters to you.
A.
If I realized
B.
Did I realized
C.
Were I realized
D.
Had I realized
【单选题】When the war ends, what does Annemarie say she will do with her friend Ellen’s necklace until Ellen returns to Denmark?
A.
She will wear it herself.
B.
She will put it back into the blue trunk to keep it safe.
C.
She will put it in a drawer in Ellen’s apartment.
【单选题】火焰的颜色取决于燃烧物质的化学成分和氧化剂的供应强度。大部分物质燃烧时火焰是橙红色的，但有些物质燃烧时火焰具有特殊的颜色，如_____燃烧的火焰是蓝色的。
A.
磷
B.
硫磺
C.
钾
D.
钠
【单选题】The sailors （）are making preparations for mooring.
A.
on the bridge
B.
at the stern
C.
in the cabin
D.
in the engine room
【单选题】Singing Alarms Could Save the Blind If you cannot see, you may not be able to find your way out of a burning building -and that could be fatal. A company in Leeds could______________(51) all that with...
A.
change
B.
cure
C.
demand
D.
set
【简答题】Who's Ellen's co-host?
【简答题】When will Ellen’s company have the goods sent?
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