人体胚胎发育的场所是（ ）
A子宫 B 输卵管 C脐带
答案：A
脐带是胎儿与母亲联系的纽带，输卵管是精子与卵细胞结合的地方，子宫是胚胎和胎儿发育的场所。
通读下面的对话，根据上下文补全对话内容。
A: Can I help you?
B: Yes, please. 1 . Where are your T-shirts?
A: Come here, please. We have T-shirts in many colors. 2 ?
B: I like white. Can I have a look at that one?
A: OK. 3 .
B: It looks nice. 4 ?
A: Oh, our T-shirts are on sale. You can buy it for only 20 yuan.
B: Great! 5 . Thank you.
A: You're welcome.
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20世纪六、七十年代，行政学摆脱了长期以来对政治科学的过分依赖，由（）研究转向应用研究。
