按照《建筑抗震设计规范》（GB50011-2001）可根据岩土名称和性状划分土的类型，下列（）选项是正确的。（）
A.只有对于指定条件下的某建筑，当无实测剪切波速时，可按土的类型利用当地经验估计土层的剪切波速
B.划分土的类型对乙类建筑是没有意义的
C.若覆盖层范围内由多层土组成，划分土的类型后可直接查表得出建筑的场地类别
D.如果有了各土层的实测剪切波速，应按实测剪切波速划分土的类型再确定建筑的场地类别
参考答案：A, B, D
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| Have you ever imagined that you could be cloned (克隆) like Dolly,the sheep,in the not too distant future? The news that a human embryo (胚胎) has been 1 cloned for the first time has caused mixed reactions(反应). The 2 was carried out by scientists from the Advanced Cell Technology Inc(ACT),in Massachusetts,US. The group 3 the news on November 25. This is not a cloned human being. "A 4 is alive,it walks,it breathes,"said Jamie Grifo,an expert on the study of cloning at New York University School of Medicine. "This is a set of cells in a lab that will be used to 5 someone's life." Such research could lead to treatment for 6 such as heart disease,AIDS and even cancer, 7 scientists. Despite high hopes from other scientists,the news 8 concerns immediately from religious and political leaders. Several 9 in the US do not allow human cloning. President George W.Bush also made it clear that he is 10 any type of human cloning. However, the 11 at ACT said they have no interest at present in developing an early embryo into 12 . Animals have been cloned repeatedly since Dolly,the sheep, 13 in 1997.And there were no real technical 14 to stand in the way of scientists making a cloned human embryo. This time the research group used traditional cloning technology with a human 15 . 16 it was given DNA from an adult cell,the egg began to 17 . 18 it was stopped from becoming a baby-at a stage in which it was 19 a ball of cells. The 20 technology has been used to clone sheep,cattle and monkeys. | ||||
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