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请在第（48）处填上正确答案。查看材料

A. Interestingly， results show that home-schooled children quite often do better than average on national tests in reading and math.
B. Critics also say that most parents are not well qualified to teach their children.
C. Learning starts with the children"s interests and questions.
D. Children who are educated at home are known as "home-schoolers."
E. In some countries， however， children are educated by their parents.
F. If the Brazilian rain forests are on the TV news.it could be a perfect time to talk about how rain forestsinfluence the climate， and how deserts are formed.

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请在第（47）处填上正确答案。查看材料

A. Interestingly， results show that home-schooled children quite often do better than average on national tests in reading and math.
B. Critics also say that most parents are not well qualified to teach their children.
C. Learning starts with the children"s interests and questions.
D. Children who are educated at home are known as "home-schoolers."
E. In some countries， however， children are educated by their parents.
F. If the Brazilian rain forests are on the TV news.it could be a perfect time to talk about how rain forestsinfluence the climate， and how deserts are formed.

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请在第（49）处填上正确答案。查看材料

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The Adjustment in Understanding of Man"s Relation to the Physical Universe
Nowadays the scattering of galaxies and the astounding abundance of stars are forcing those who ponder such matters to a further adjustment of their concept of the place and function of man in the material universe.
In the history of the51human mind， with its increasing knowledge of the surrounding context， there must have been a time when the philosophers of the52tribes began to realize that the world was not simply centered on man himself. The geocentric concept， which accepted a universe centered on the earth， then became common53
The second adjustment in the understanding of man"s relation to the physical universe was not generally acceptable54the sixteenth century. Copernican revolution soundly55the heliocentric Concept， the theory of a universe56on the sun. Man is a stubborn adherent to official dogma; eventually， however， he accepted the sun as the center.
Then， forty years ago， came the need for a third adjustment. This57has deeply exploded man"s pride and58， for it has carried with it the knowledge of the appalling number of galaxies.
The galactocentric universe59puts the earth and its life near the edge of one great galaxy in a universe of millions of galaxies. Man becomes peripheral among the billions of stars of his own Milky Way; and， according to the revelations of paleontology and geochemistry， he is60and apparently transient in the61of cosmic time.
The downgrading of the earth and sun and the elevation of the galaxies is not the end of this62of scientific pilgrims through philosophic fields. The need for another63adjustment now64not wholly unexpected by scientists，65wholly the result of one or two scientific revelations.
Our new problem concerns the spread of life throughout the universe. As unsolicited spokesmen for all the earthly organisms of land， sea， and air， we ask the thrilling question: Are we alone？
请在第（51）处填上正确答案。查看材料

A. ingenious
B. evolving
C. creative
D. eligible

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It call be inferred from the text that__________．查看材料

A. scientists rarely expect to make money from their discoveries in basic science
B. it will be much easier to conveg scientific findings into cash in the near future
C. the boom of the l990s could be considered somewhat unhealthy
D. the boom of the l990s willlast at least for several decades

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请在第__（47）__处填上正确答案。 查看材料

请在第__（49）__处填上正确答案。 查看材料

It call be inferred from the text that__________． 查看材料

请在第（48）处填上正确答案。查看材料

请在第（47）处填上正确答案。查看材料

请在第（49）处填上正确答案。查看材料

It call be inferred from the text that__________．查看材料