What aspect of the adopted children’s language development differed from that of US—born children、

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• 1Snedeker，Geren and Shafto based their study on children who__________.

  A.were finding it difficult to learn English

  B.were learning English at a later age than US children

  C.had come from a number of language backgrounds

  D.had taken English lessons in China

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• 2What is the writer’s main purpose in Paragraph 2 、

  A.To reject the view that adopted children need two languages．

  B.To argue that culture affects the way children learn a language．

  C.To give reasons why adopted children were used in the study．

  D.To justify a particular approach to language learning．

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• 3The closer a plant is to its natural state; the less suitable it is to__________．

  A.show that organic crops are safer than conventional ones

  B.be specially trained

  C.improve soil quality

  D.poison you

  E.be eaten

  F.affect their nutritional content

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• 4The weather conditions during the growth of crops__________．

  A.show that organic crops are safer than conventional ones

  B.be specially trained

  C.improve soil quality

  D.poison you

  E.be eaten

  F.affect their nutritional content

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• 5There is no convincing evidence to__________．

  A.show that organic crops are safer than conventional ones

  B.be specially trained

  C.improve soil quality

  D.poison you

  E.be eaten

  F.affect their nutritional content

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• 6What does the Harvard finding show、

  A.Not all toddlers use babytalk．

  B.Some children need more conversation than others．

  C.Language learning takes place in ordered steps．

  D.Not all brains work in the same way．

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• 7When the writer says “critical period”，he means a period when__________．

  A.studies produce useful results

  B.adults need to be taught like children

  C.1anguage learning takes place effectively

  D.immigrants want to learn another language

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• 8If two sisters are identical twins．their complete DNAs are _________．

  A.the same

  B.unique

  C.different

  D.similar

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• 9DNA fingerprinting is a technique of _________．

  A.grouping DNA strands into structures

  B.segmenting DNA with probes

  C.constructing body tissues by enzymes

  D.identifying a person by comparing DNAs

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• 10DNA fingerprinting was first used in _________．

  A.criminal investigation

  B.animal reproduction

  C.private laboratories

  D.genetic disease detection

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