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

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• 1What 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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• 2What aspect of the adopted children’s language development differed from that of US—born children、

  A.The rate at which they acquired language．

  B.Their first words．

  C.The way they learnt English．

  D.The point at which they started producing sentences．

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• 3Snedeker，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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• 4What 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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• 5The 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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• 6If two sisters are identical twins．their complete DNAs are _________．

  A.the same

  B.unique

  C.different

  D.similar

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• 7DNA 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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• 8DNA fingerprinting was first used in _________．

  A.criminal investigation

  B.animal reproduction

  C.private laboratories

  D.genetic disease detection

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• 9People question the reliability of DNA fingerprinting for _________．

  A.the subjective interpretation of test results

  B.its complex procedure

  C.its large scale research

  D.its uniform testing standards

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• 10It can be inferred from Paragraph 5 that DNA fingerprinting _________．

  A.is costly to the police

  B.could be a social issue

  C.1s the only way to prove innocence

  D.has been a profitable business

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