问题
单项选择题
胚胎在母体内的发育过程分为胚期和胎期两个时期，以下哪个过程不在胚胎期完成（）
A.受精
B.卵裂
C.胚层形成
D.器官原基的建立
E.各器官的结构和功能逐渐完善
答案
参考答案：E
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胚胎在母体内的发育过程分为胚期和胎期两个时期，以下哪个过程不在胚胎期完成（）
A.受精
B.卵裂
C.胚层形成
D.器官原基的建立
E.各器官的结构和功能逐渐完善
参考答案：E
| 选择适当的句子补全对话。 | |
| [It's part of the story about Snow White (白雪公主) and the Seven Dwarfs (七个小矮人).] Following the animals, Snow White found a little hut (小屋). There wasn't anyone in it, and it was indeed very dirty. Snow White didn't know it's the Seven Dwarfs' house. Snow White: 1 I'll clean the house and surprise them, then maybe they'll let me stay. Dear squirrels, 2 ? The squirrels: Certainly. 3 Snow White: Could you clean up the room? The squirrels: Dear Snow White, we want to help you, too. Snow White: Thanks. Please wash the dishes. Snow White: Could you please help me, dear weasels? The weasels (鼬): 4 . Snow White: Please clean the fireplace and I'll use the broom. 5 After their hard work, the house became tidy and clean.
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