. The glass doors have taken the place of the wooden ones at the entrance, __________ in the natural light during the day. A. to let B. letting C. let D. having let
设集合A＝{x||x－a|<1，x∈R}，B＝{x|1<x<5，x∈R}，若AB，则a的取值范围为________．
It is difficult for us to imagine_____ life was like for slaves in the ancient world. A. where B. what C. which D. why
若10x=3,10y=4,则10x-y=____________.
下图是北半球某地二分、二至日大阳高度日变化。读下图回答问题。 一年中该地正午物体影子朝北的时间约为（ ） A．3个月
HONG KONG-----Hong Kong Disneyland is too crowded,a senior Chinese tourism official said today,hinting that another Disney Park is necessary to accommodate demand from China’s huuge population. The
若函数y= -2xm+2 +n-2正比例函数，则m的值是 ，n的值为________．
是方程
的两根，则
的值为
B．
C．
D．
