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    2、Exactly when the first people arrived in __1__ as California, no one really knows．

    Scientists believe that these first setters crossed the Berlin Strait from Asia to Alaska __2__ of a land bridge．

    Thousands were killed or __3__ slavery．__4__, many __5__ brought by Europeans．

    Cloning has two __6__．Firstly, Secondly, it is valuable for research on __7__ and for medical research on animals．Many __8__ to clone mammals failed. But at last the __9__ of the scientists was rewarded in 1996 __10__— the cloning of Dolly the sheep．

    2、1．what we now know   2．by means of   3．forced into   4．In addition   5．died from  6．major uses  7．new plant species    8．attempts      9．determination and patience   10．with a breakthrough

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    Exactly when the first people arrived in __1__ as California, no one really knows．

    Scientists believe that these first setters crossed the Berlin Strait from Asia to Alaska __2__ of a land bridge．

    Thousands were killed or __3__ slavery．__4__, many __5__ brought by Europeans．

    Cloning has two __6__．Firstly, Secondly, it is valuable for research on __7__ and for medical research on animals．Many __8__ to clone mammals failed. But at last the __9__ of the scientists was rewarded in 1996 __10__— the cloning of Dolly the sheep．

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    科目：高中英语 来源： 题型：

    Exactly when the first people arrived in __1__ as California, no one really knows．

    Scientists believe that these first setters crossed the Berlin Strait from Asia to Alaska __2__ of a land bridge．

    Thousands were killed or __3__ slavery．__4__, many __5__ brought by Europeans．

    Cloning has two __6__．Firstly, … Secondly, it is valuable for research on __7__ and for medical research on animals．… Many __8__ to clone mammals failed. But at last the __9__ of the scientists was rewarded in 1996 __10__— the cloning of Dolly the sheep．

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    科目：高中英语 来源：湖南省岳阳一中2012届高三上学期第三次月考英语试题 题型：053

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    　　Exactly when the first people arrived in 　　1　　 as California, no one really knows．

    　　Scientists believe that these first setters crossed the Berlin Strait from Asia to Alaska 　　2　　 of a land bridge．

    　　Thousands were killed or 　　3　　 slavery．　　4　　, many 　　5　　 brought by Europeans．

    　　Cloning has two 　　6　　．Firstly,…Secondly, it is valuable for research on 　　7　　 and for medical research on animals．…Many 　　8　　 to clone mammals failed．But at last the 　　9　　 of the scientists was rewarded in 1996 　　10　　－the cloning of Dolly the sheep．

    查看答案和解析>>


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