问题
单项选择题
下列关于胚胎干细胞的叙述，不正确的是（）
A.囊胚所有的细胞都是胚胎干细胞
B.胚胎干细胞具有发育全能性
C.可从原始性腺中分离培养
D.在体外培养条件下，可以只增殖不分化
答案
参考答案：A
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下列关于胚胎干细胞的叙述，不正确的是（）
A.囊胚所有的细胞都是胚胎干细胞
B.胚胎干细胞具有发育全能性
C.可从原始性腺中分离培养
D.在体外培养条件下，可以只增殖不分化
参考答案：A
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| The most unhappy day in my life was that day my father was in bed forever (永远). On that day before going to work, I was a little surprised that my father was still 1 . I thought to 2 , "Is he okay?" I came to his bed and called him, 3 there was no answer. Panicking (惊慌失措), I shook his hands and 4 he was not breathing (呼吸). My heart was broken and I 5 out. Soon many people 6 into the house—they couldn't believe my father was 7 . Just the evening before, they still saw my father 8 his usual walk in the rice field. I held his cold hand and I didn't want to leave him. I knew it was the 9 time I would sit beside him. My father was my best friend. When I felt sad, he was 10 there for me. He provided me 11 all I could ever ask for. Until my father's death I realized 12 made me happier than a peaceful day, both my  13 by my side. My family is my happiness. I'll never 14 the happiness my father brought to me. 15 I feel sad or think about something, I whisper (低声说) to him, "Daddy, where are you? Are you here?" It brings me peace because I know somewhere he is listening. | ||||
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