第2题: [单项选择]It can be inferred that if a rocket misses its target, it keeps on traveling through space until ______. A. it reaches the "black hole" B. it is caught in the gravitational field of another planet C. it runs out of fuel D. it explodes 参考答案:B 答案解析:细节理解题。答案可在第四段第三句里找到。