题目

如图，一辆汽车在一个十字路口遇到红灯刹车停下，汽车里的驾驶员看地面的斑马线前后两端的视角分别是∠DCA＝30°和∠DCB＝60°，如果斑马线的宽度AB＝3米，驾驶员与车头的距离是0.8米，这时汽车车头与斑马线的距离x是多少?     答案：过点C作AB的垂线，垂足为H. （1分）     由题意，∠CAH＝∠DCA＝30°，∠CBH＝∠DCB＝60°，………(2分)         ∴∠ACB＝∠CAB＝30°，         ∴CB＝AB＝3………………………(3分)         在Rt△BCH中，CB＝3，∠CBH＝60°，         ∴BH＝CB＝1.5………………………(5分)         ∴x＝1.5It's Jim's birthday today.It's _____.He is five years old.He _____ many nice birthday presents （礼物） from his family and one of them _____ a big drum（鼓）．“Who gives _____ the drum？” his father asks.“His grandfather _____， ” answers Jim's mother.Jim likes his drum very much.He makes a noise（噪音） with it, but his mother _____ anything about it.His father is not at home.He is working _____ a school.So he doesn't hear the noise.But one of the neighbors （邻居） doesn't like the noise at all.So one morning she takes a knife _____ goes into Jim's _____.Jim is making a noise with the drum.She says to him, “Hello, Jim.Do you know there is something ______ in your drum？Here's a knife.Open （打开） the drum and let's find （找到） it.”【1】A. January the ten B. ten January C. January tenth D. the ten January【2】A. get B. is get C. to get D. gets【3】A. be B. am C. is D. are【4】A. him B. his C. her D. he【5】A. give B. gives C. do D. does【6】A. say B. says C. doesn't say D. don't say【7】A. on B. of C. in D. for【8】A. or B. and C. but D. too【9】A. room B. school C. class D. restaurant【10】A. bad B. big C. small D. nice