题目内容：
［A］the universe［B］Earth’s gravity［C］the earth［D］outer space
参考答案：
选择题：2.Some persons have traveled into outer space afte
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3.We have explored or sent robot spaceships to the
3.We have explored or sent robot spaceships to the
4.Why is the conquest of space more than a great a
4.Why is the conquest of space more than a great a
5.The moon and the asteroids are alike with respec
5.The moon and the asteroids are alike with respec
On Students Choosing Lecturers
On Students Choosing Lecturers
Part II Reading comprehension
Part II Reading comprehension