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

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• 1When 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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• 2What 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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• 3What 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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• 4Snedeker，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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• 5What 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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• 6DNA 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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• 7DNA fingerprinting was first used in _________．

  A.criminal investigation

  B.animal reproduction

  C.private laboratories

  D.genetic disease detection

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• 8People 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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• 9It 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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• 10Why did the wild life experts visit the Kalahari Desert、

  A.To find where honey badgers live.

  B.To catch some honey badgers for food.

  C.To find out why honey badgers have a bad reputation.

  D.C.To find out why honey badgers have a bad reputation.D.To observe how honey badgers behav

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