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【单选题】
生产关系变革的根源是( )。A.
先进思想理论的形成
B.
生产力发展的客观要求
C.
新的生产关系已经出现
D.
人们进行自觉的革命活动
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举一反三
【单选题】The minimum temperature required to ignite gas or vapor without a spark or flame being present is called ______．
A.
Flash point
B.
Fire point
C.
Autoignition temperature
D.
Lower explosive limit
【单选题】D Our surroundings are being polluted faster than ever and it seems that people cannot prevent it. Time is bringing us more people, and more people will bring us more industry', more cars, larger citi...
A.
the population of the world is increasing faster
B.
people use too many man-made materials
C.
we have more industry
D.
we are producing more cars, trucks and buses
【单选题】As you know，it is my duty to________my younger sisters from being hurt when they are in danger.
A.
prevent
B.
save
C.
stop
D.
protect
【简答题】Being a man is a pre-existent condition. ( )
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