一个长方形的长和宽各增加20%，则它的面积增加（ ）
A．44%
B．40%
C．20%
D．400%
设原长方形的长和宽分别为a和b，则增加后的长和宽分别为（1+20%）a和（1+20%）b，
原来的面积：ab，
现在的面积：（1+20%）a×（1+20%）b，
=1.2a×1.2b，
=1.44ab；
面积增加：（1.44ab-ab）÷ab，
=0.44ab÷ab，
=0.44，
=44%；
答：它的面积增加44%．
故选：A．
| 97．Because Web servers are platform and application (1) , they can send or request data from legacy or external applications including databases. All replies, once converted into (2) mark-up language, can then be transmitted to a (3) . Used in this way, Intranets can (4) lower desktop support costs, easy links with legacy applications and databases and, (5) all, ease of use. |
(4)
A．earlier
B．front
C．later
D．backward