单选题
We do not feel the gravitational pull of a packet of butter because
A、
it is too small to have a gravitational pull of its own.
B、
its pull is so small that we tend to ignore it.
C、
its pull disappears in the presence of the earth's gravitation.
D、
it tends to melt and loses its gravitational pull.
【正确答案】
B
【答案解析】
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