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桃在中国人眼中是长寿的象征,因此有 “ 寿桃 ” 之称.桃树属于绿色开花植物,所结果实有 (果皮无)和桃(果皮有)之分.依据图表分析回答:( [ ] 内填序号) ( 1 )桃子可食部分 [ 7] 由花结构中的 [ ] 发育而来,桃的繁殖方式是 . ( 2 )从结构层次上看,香甜可口的桃子属于 . ( 3 )在遗传学上,桃子的桃和称为一对 . ( 4 )根据表中第 组信息可以判断 为显性性状. (5) 若显性基因用 B 表示,隐性基因用 b 表示,则第 II 组子代的基因组成是 .
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举一反三
【单选题】—May I speak to Miss Brown , Please? — ____________
A.
Who are you?
B.
Who’s this?
C.
This is Miss Brown .
D.
My name is Kate Brown.
【判断题】Addressing forms like “Miss Mary”, “Brown” by the Chinese may be a form. of cultural compromise.()
A.
正确
B.
错误
【单选题】The students ______ busily when Miss Brown went to geta book she ______ in the office.
A.
had written left
B.
were writing hasleft
C.
had written had left
D.
were writing had left
【简答题】This is Miss Brown. Her name is Alice Brown. She is from America. Her telephone number is 8257-6632. She is from America. She is nice. She is a good teacher. I like(喜欢) Miss Brown very much. 根据短文内容，完成...
【简答题】2 弹簧下面悬挂质量为50 g的物体,物体沿竖直方向的运动学方程为 x=2sin10t,平衡位置为势能零点(时间单位:s, 长度单位:cm)。(1) 求弹簧的劲度系数,(2) 求最大动能,(3)求总能。
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