“治世不一道,便国不法古。”——《史记》
请回答:
每一个区域都有特定的地理环境,并对区域发展产生深刻的影响。读长江中下游地区水系图,完成下面小题。
B
Happy Middle School
We're a bilingual(双语的) school for children of 6~15.We want a cook,a library assistant, a sports coach and a language teacher.
Jobs
Ages
Languages
Skills(技能)
Others
cook
25~40
Chinese
can cook Chinese and Western food
healthy
library
assistant
20~35
Chinese,
English
can read different kinds of books
careful
sports
coach
20~40
Chinese,
major in(主修) P.E.
and strong
language
teacher
—
major in English
17-7=____65-60= ____70+8=____58-8=____12-9=____0+20=____12-6+9=____
11-8=____95-5=____40+9=____9+20=____14-9=____6+20=____16-8-6=____
如图,梯形ABCD中,∠ABC和∠DCB的平分线相交于梯形中位线EF上的一点P,若EF=3,则梯形ABCD的周长为( )