Nowadays, college and high school students are getting a chance to learn what it takes to explore in space. Someday- perhaps a lot sooner than you imagine- you might get to design, build and launch your own satellite. If you do, youre sure to have fun. And you might also get crazy about science for life.
58. Compared with the traditional ones, the new satellites ____.
A. need long start-up times B. are low-cost and small-sized
C. are very hard to operate D. collect more information in orbit
59. What does the underlined word obstacle probably mean?
A. An aim to achieve in the near future.
B. An imaginat
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