A：施莱登、施旺
B：列文虎克、维萨里
C：胡克、魏尔肖
D：虎克、施旺
直接影响城市地租高低的因素有（ ）
直线y=m分别与曲线y=2x+3，y=x+lnx交于A、B，则|AB|的最小值为（ ）
This book is a little above my head, because there are too many new words in it.
—Boy, you ____ lean (伸) out of the window while the bus is running. That's dangerous.
—Sorry, I won't do that again.
中国古代选官制度的演进的正确顺序是
