问题
单项选择题 A1/A2型题
各种血细胞均起源于骨髓的（）
A.髓系干细胞
B.淋巴系干细胞
C.基质细胞
D.定向祖细胞
E.多能造血干细胞
答案
参考答案：E
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各种血细胞均起源于骨髓的（）
A.髓系干细胞
B.淋巴系干细胞
C.基质细胞
D.定向祖细胞
E.多能造血干细胞
参考答案：E
| 根据对话内容从方框内的七个选项中选择五个适当的选项补全对话。 | |
| A: Sally are you free tomorrow evening? B: 1 _______ A: Why not go to the movies? B: 2_______ I like seeing movies very much. A: 3_______ B: Well, I like comedies because they are funny. What about you? A: I like them, too. I hear Mr. Bean is on. 4_______. B: Sure. Let's meet at seven o'clock tomorrow evening. A: Oh, it's a little earlier. B: 5_______. A: OK. See you tomorrow evening. B: See you.
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