1. What do both theories assume to be true?
　　[ A ] That new material is continually being formed.
　　[ B ] That，in time，the universe will contract
　　[ C ] That the universe is expanding at present.
　　[ D ] That “a big bang” started the expansion.
　　2. According to Lemaitre, the separate galaxies formed _______。
　　[ A ] during a pause in the expansion of the universe
　　[ B ] at the time of the primeval explosion
　　[ C ] and will continue to form for ever
　　[ D ] when all the matter in the universe was all concentrated in one small mass
　　3. What is the basic difference between the two classes of theories?
　　[ A ] It concerns the place and time of the formation of matter.
　　[ B ] It is whether the universe will continue to expand or not.
　　[ C ] It is the current state of the universe.
　　[ D ] The variations on evolutionary theories cause the difference.
　　4. According to Hoyle and his friends at Cambridge, _______。
　　[ A ] the explosion occurred much earlier than Lemaitre suggested
　　[ B ] it is hard to see how matter could be formed in this way
　　[ C ] the expansion of the universe is not a real one
　　[ D ] new material is continually being created
　　5. We see distant galaxies as they were long, long ago because _______。
　　[ A ] they were closer together then
　　[ B ] the universe has always looked as the same
　　[ C ] their light takes so long to reach us
　　[ D ] they have travelled such a long way