According to accepted nineteenthcentury theories,which two elements form the composition of lichens、

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• 1All of the following are true about Nylander except

  A.he was the first to use chemical reagents in the taxonomy of lichens.

  B.he believed that lichens were simple plants.

  C.he was an esteemed lichenologist.

  D.he taught botany at the University of Paris.

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• 2Which of the following is not true、

  A.Nylander accepted his colleagues′ theories on the composition of lichens.

  B.Eighty percent of lichens bear Nylander′s name.

  C.Today lichens are used to detect atmospheric pollution.

  D.Most botanists consider lichens to be a compound species.

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• 3Internationally renowned scientists sent lichen samples to Nylander because

  A.he considered them to be simple plants.

  B.he used reagents to determine their use.

  C.he analyzed and classified them.

  D.he collected and preserved them.

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• 4The dog saw his _____ in the pool of water.

  A.reflect

  B.reflection

  C.bone

  D.imagination

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• 5Exchanges of language and culture were a direct result of _____ .

  A.commence

  B.commerce

  C.comment

  D.commentary

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• 6How could William Nylander best be described、

  A.degenerate

  B.domineering

  C.ingenious

  D.anxious

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• 7Given the present growth rate of the world′s population and our ability to produce food,

  A.the United States will be able to feed half the world by 2025.

  B.the future will see no more hunger.

  C.the developed nations will change their eating habits.

  D.we will encounter very serious problems in the near futur

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• 8The term“Green Revolution”refers to

  A.the political situation in Greenland

  B.the increased use of scientific methods in agriculture.

  C.the upheavals in the underdeveloped nations.

  D.the crop shortages experienced in 1972.

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• 9Each year,the world′s food reserves reduce by

  A.10 million tons.

  B.20 million tons.

  C.30 million tons.

  D.40 million tons.

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• 10It is expected that crop yields will drop,especially in underdeveloped countries,mainly because of

  A.disastrous weather.

  B.weak strains.

  C.finance shortages.

  D.revolutions.

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