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【简答题】
世界上第一只克隆绵羊"多利"的培育过程如下图所示，图中A为黑面绵羊，B为白面绵羊。 请举例说明克隆绵羊培育成功的实际意义。
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举一反三
【单选题】关于月经的临床表现,下列描述正确的为
A.
初潮的迟早与营养及体质强弱有关
B.
正常月经呈鲜红色，易凝固
C.
月经周期是指月经干净到下次月经来潮
D.
初潮的年龄大多数在18岁左右
E.
决定月经周期长短的是黄体期
【单选题】—When did Yang Juan begin to learn English? —At the age of six, she began teaching _______ English.
A.
her
B.
hers
C.
herself
D.
she
【单选题】Only _____ as an interpreter _____ how important it was to practise spoken English.
A.
when did I work…I realized
B.
when did I work…did I realize
C.
when I work…did I realize
D.
when I worked…did I realize
【单选题】When did Scotland join the Union by agreement of the English and Scottish parliaments?
A.
In 1715
B.
In 1688
C.
In 1745
D.
In 1707
【单选题】Only _____ as an interpreter _____ how important it was to practise speaking English. [ ]
A.
when did I work…I realized
B.
when did I work…did I realize
C.
when I work…did I realize
D.
when I worked…did I realize
【简答题】.Only _____ as an interpreter _____ how important it was to practise speaking English. A．when did I work…I realized B．when did I work…did I realize C．when I work…did I realize D．when I worked…did I re...
【单选题】When did the children begin to speak English?
A.
When they are 5 years old.
B.
When they are 6 years old.
C.
When they are 7 years old.
D.
When they are 8 years old.
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