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【单选题】
如图所示,在两块相同的竖直木板之间,有质量均为m的4块相同的砖,用两个大小均为F的水平力压木板,使砖块静止不动,则第2块砖对第3块砖的摩擦力大小是( )A.
0
B.
mg
C.
mg
D.
2mg
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举一反三
【单选题】Throughout______ history, ______ English language is made up of the rules each group of people brought to Britain with them.
A.
the, the
B.
/,the
C.
the,/
D.
/,/
【简答题】空运单既非航空运输合同，也非在运货物的物权凭证，相反只是一种（）的文件。
【单选题】Historians sometimes forget that history is continually being made and experienced before it is studied, interpreted, and read. These latter activities have their own history, of course, which may imp...
A.
occurrence of events extremely similar to past events.
B.
history of the activities of studying, interpreting, and reading new historical writing.
C.
change in people's understanding of the past due to more recent historical writing.
D.
overturning of established historical interpretations by politically motivated politicians.
E.
difficulty of predicting when a given historical interpretation will be overturned .
【单选题】What made the history lecture so interesting?
A.
It was about American women instead of the American revolution,
B.
The professor talked about a trip and he was challenged.
C.
The professor made a good speech.
D.
The professor was challenged by a student by his lack of knowledge of female historical character.
【单选题】_______, women have changed history in terms of the contributions they have made.
A.
To some extent
B.
In conclusion
C.
In addition
D.
As a whole
【单选题】Obama made _______ history by being elected as ________ first black president of the US.
A.
不填；the
B.
a; the
C.
a; a
D.
the; a
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