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【单选题】听力原文： Americans recognize that there is a past on which the present rests. But they have not developed their sense of the depth of time to the extent that this has been done in the Middle East and Sou...
A.
Twenty thousand years.
B.
Two to six thousand years.
C.
A thousand years.
D.
Hundreds of years.
【简答题】堆栈数据的进出原则是 。
【简答题】2013年诺贝尔生理学或医学奖授予了发现囊泡运输调控机制的三位科学家。甲图表示细胞通过形成囊泡运输物质的过程,乙图是甲图的局部放大。不同囊泡介导不同途径的运输,图中的1~5表示不同的细胞结构。请分析回答下列问题 ([ ]中填写图中数字) : ( 1 ) 囊泡膜的主要化学成分是____。细胞代谢的中心是[_]_____ 。 ( 2 )甲图中,囊泡 X 由 [ 3 ] 经“出芽”形成,到达 [ 4 ]...
【单选题】The literature works is said ______ into many foreign languages ______ in the past few years.
A.
to have translated; in length
B.
to have been translated; at length
C.
to be translated; at length
D.
to being translated; for length
【单选题】Most analysts focus on the cost of tuition as the way to measure the cost of a college education. But incidentals, such as textbook costs, are rarely considered. A researcher at Drummand University wa...
A.
the textbook cost of first-year Drummand University students
B.
the year in school of Drummand University students
C.
the age of Drummand University students
D.
the cost of incidental expenses of Drummand University students
【单选题】Throughout the past few centuries there ______ recorded reports of space vehicles which have visited our earth from another planet.
A.
have been
B.
are
C.
had been
D.
were
【简答题】请用化学式表示下列物质： （1）家庭生活中常用的一种调味品的主要成分是______； （2）常温下，铝表面生成的致密的保护膜是______； （3）人体“第一能源”中提供能量的最基本的物质是______．
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