The best title for this passage is______. If the distance between two objects is shortened by half, their gravitational attract

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问题 The best title for this passage is______.
If the distance between two objects is shortened by half, their gravitational attraction will______.

选项 A、double
B、become four times stronger
C、be the same
D、get four times weaker

答案B

解析根据最后一段第一句可知，如果把两物体的距离改成两倍，它们之间引力就会减少成原数的四分之一，相反，则会加强。故选B。

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