In astronomical terms, a cluster _____ .

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• 1Which of the following is TRUE according to the passage、

  A.Ninety percent of all the matter in the universe is invisible.

  B.Dark matter causes visible matter to behave in a strange way.

  C.Galaxies in a cluster sometimes behave in an unusual manner.

  D.invisible matter keeps galaxies together with gravity.

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• 2Why is the size of the hip and leg joints imortant in establishing the human habit of bipedalism、

  A.they support human body in an upright position.

  B.they are the only observable evidence in australopithecines study.

  C.the evolution of the joints is the fastest in animals.

  D.they mark the major difference between humans and humanlike animals.

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• 3Which of the following is TRUE about Lucy according to Junger、

  A.Lucy walked more like apes than like human beings.

  B.Lucy moved her steps in the same manner as people.

  C.Lucy might walk quite differently from modern man.

  D.Lucy had hip and leg joints like people's.

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• 4Jungers'report was based upon his comparison of _____ .

  A.the body size of people, apes and australopithecines

  B.the skeleton of people, apes and australopithecines

  C.the hips and leg joints of people, apes and australopithecines

  D.the size of hip and leg joints of modern people and australopithecines

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• 5Jungers'finding showed that _____ .

  A.human beings walked upright later than australopithecines

  B.bipedalism might have developed suddenly in early humans

  C.early humans might have learned to walk gradnally

  D.human beings evolved from australopithecines rather than from apes

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• 6The nearer a planet is to the sun, _____ .

  A.the lighter it is

  B.the greater gravity it exerts

  C.the heavier it is

  D.the faster it orbits

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• 7According to Newton's principle, _____ .

  A.the force of gravity keeps planets orbiting around the sun rather than flying off

  B.the sun is the most massive object, making up 99．8 percent of the mass of the solar system

  C.the amount of mass determine how fast the objects travel as they orbit each other

  D.Pluto receives the least force of gravity from the sun of all the planets in the solar system

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• 8The author considers that a fairy story is more effective when it is _____ .

  A.repeated without variation

  B.treated with correct attitude

  C.adapted by the parent

  D.suited to the age of the child

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• 9Some people dislike fairy stories because they feel that they _____ .

  A.tempt people to be cruel to children

  B.show the primitive cruelty in children

  C.lend themselves to undesirable experiments with children

  D.increase the tendency to be aggressive in children

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• 10The author thinks that fairy stories are a means by which children's impulses may be _____ .

  A.beneficially channelled

  B.given a destructive tendency

  C.held back until maturity

  D.effectively suppressed

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