【单选题】
_____the center of our planetary system was considered as heresy by the church in the Middle Ages.
①
It is the sun and not the earth
②
That the sun and not the earth is
③
Being the sun and not the earth
④
The sun and not the earth
【判断题】
半导体的导电能力介于导体与绝缘体之间,硅和锗是最重要的两种半导体材料。
【单选题】
Nowhere in nature is aluminum found free, owing to its always _____with other elements, most commonly with oxygen.
【单选题】
We feel it is high time that the Government _____something to check the inflation.
【单选题】
Physics is the present day equivalent of _____used to be called natural philosophy, form _____most of present day science arose.
【单选题】
The _____problem of bringing a spaceship back from the moon has been solved.
【单选题】
After so many weeks without rain, the ground quickly _____the little rain that fell last night.
【单选题】
He might have been killed _____the timely arrival of the ambulance.
【单选题】
Einstein won the Nobel Prize in 1921 and enjoyed great fame in Germany until the rise of Nazism _____he was expelled from Germany because he was a Jew.
【单选题】
在马克思主义看来,人的本质在其现实性上是( )。