题目

如图，已知OE是∠AOC的角平分线，OD是∠BOC的角平分线． （1） 若∠AOC=120°，∠BOC=30°，求∠DOE的度数； （2） 若∠AOB=90°，∠BOC=α，求∠DOE的度数． 答案：解：∵OE是∠AOC的角平分线，OD是∠BOC的角平分线，∠AOC=120°，∠BOC=30°，∴∠EOC=60°，∠DOC=15°，∴∠DOE=∠EOC﹣∠DOC=60°﹣15°=45° 解：∵OE是∠AOC的角平分线，OD是∠BOC的角平分线，∠AOB=90°，∠BOC=α，∴∠EOC= 12 （90°+α），∠DOC= 12 α，∴∠DOE=∠EOC﹣∠DOC= 12 （90°﹣α）﹣ 12 α=45°．In schools all over the world, boys and girls are studying foreign languages. Everyone knows his own language, but when you are in other countries, you are trying to understand people in other countries.There are about three thousand languages in the world. English is one of them, but it is very important because so many people use it.What is the best way to learn English? Listen to English first, then use it at every chance.根据短文内容判断句子正误,正确的填T错误的F。（5分）【小题1】Students are learning foreign languages in schools.【小题2】People in other countries needn’t understand people【小题3】There are about three hundred languages in the world.【小题4】English is very important, so many people   like it【小题5】Everyone knows his own language.