题目

---I heard your mother enter your bedroom all of________ sudden when you were watching a program about _________Olympics.---Yes. She looked angry for I forgot to do my homework.A. ／：／ B. a：／ C. ／：the D. a；the 答案：【答案】D【解析】句意：我听说当你在看奥运节目的时候你妈妈突然进到你的卧室。是的，她看起来很生气，因为我忘了做作业。不定冠词a/an一个，a用于辅音开头的单词前，an用于元音开头的单词前；all of a sudden突然；定冠词the，放在专有名词前；故选D一次函数y=x+1的图象交x轴于点A，交y轴于点B．点C在x轴上，且使得△ABC是等腰三角形，符合题意的点C有____个．A.2B.3C.4D.5．