一个长方形的长为xcm，宽比长少4cm，则这个长方形的面积是（ ）cm2，若将长方形的长和宽都扩大3cm，则面积增大了（ ）cm2。
x2-4；6x-3
表现为肾小球性血尿的疾病是()
A．狼疮性肾炎
B．出血性膀胱炎
C．链球菌感染后肾小球肾炎
D．胡桃夹现象
E．肾炎型肾病
You want to know what the safest place for children 77．______is in the car The experts say the back seat is the safest for 78．______them. The back seat is farthest away off the force of a head- 79．______on collision(迎头撞击), which can lead serious injuries. 80．______If your child is below 8 and weighs no more than 85 81．______pounds, it is necessarily to fit your car with a safety seat. 82．______Moreover, the safety seat must be held in place of on the83．______car’s back seat. If your child do need your attention while 84．______you driving, don’t look back with only one hand on the 85．______wheel. You’d better stop the car. 86．______
