1.D 2.D 3.C 4.D 5.B 6.A 7.B 8.D 9.C 10.D
  S1.landing S2.fifty S3.experienced S4.scientists S5.plans S6.dangers S7.train
  S8.The health and physical condition of the men were,of course,very important.Only those in very good health and physical condition were chosen.
  S9.They studied the stars and the moon,and they also studied geology,the science of rocks.This was necessary because astronauts would have to look for rocks on the moon.They would try to find rocks which might help to tell the age of the moon.
  S10.They learned all the technical details of the spaceships and rockets.They learned how every part of a spaceship and its instruments work.They also learned every detail of the ground control system.
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