问题
单项选择题
小儿造血分哪两个阶段（）。
A.胚胎期造血和生后造血
B.胚胎期造血和骨髓造血期
C.骨髓造血期和肝造血期
D.骨髓造血期和骨髓外造血
E.中胚叶造血期和骨髓造血期
答案
参考答案：A
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小儿造血分哪两个阶段（）。
A.胚胎期造血和生后造血
B.胚胎期造血和骨髓造血期
C.骨髓造血期和肝造血期
D.骨髓造血期和骨髓外造血
E.中胚叶造血期和骨髓造血期
参考答案：A
| 根据句意，从方框内选择合适的单词或短语，并用其适当形式完成句子。 | |
2. When we _______ out, the thief had already run off. 3. Have you ever ______ your keys in your room? 4. I am sorry that all the tickets for the day have been ______. 5. Lily's race-car ______ halfway. She had to give up the race. |