我国的“嫦娥工程”将按“绕月、落月和驻月”三步进行，计划2012年实施落月探测。已知月球上无大气、无磁场、弱重力。下列各项中，在月球上不能实现的是(   )

新文化运动提出科学的口号，认为“其效将使人间之思想行为，一尊理性，而迷信斩焉，而无知妄作之风息焉。”据此可知其核心作用是

    My name is John. I am a pupil. I like to read books on Sundays. I live in a house beside the zoo. It's near the school. So I walk to school every day. Tom is my friend. He lives far from the school, so he goes to school by bus. He likes to play on the computer on Sundays.

已知实数a、b满足等式2^a=3^b，下列五个关系式：

①0＜b＜a  

②a＜b＜0

③0＜a＜b 

④b＜a＜0 

⑤a=b=0，

其中有可能成立的关系式有（　　）