问题
单项选择题
囊胚开始着床的时间约在受精后
A．3d～4D
B．6d～7d
C．10d～12d
D．12d～14d
E．13d～15d
答案
参考答案：B
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囊胚开始着床的时间约在受精后
A．3d～4D
B．6d～7d
C．10d～12d
D．12d～14d
E．13d～15d
参考答案：B
用方框中单词填空。
—My favorite subject is PE. 2. —What's your sister's favorite food? —_____ favorite food is hamburgers. 3. Miss Jone is my art teacher. _____ is my favorite teacher. 4. —What's your brother's favorite sport? —_____ favorite sport is ball games. _____ likes soccer b est. 5. Art and PE are my favorite subjects. Because _____ are exciting. |