【简答题】看图填空,一空一词。 1. What can you see in the picture? We can see that a school ______ ______ a skating Marathon. 2. How many people are there in the picture? And who are they? There are seven. Five are stude...
【简答题】如图,在△ABC中,AD⊥BC于D,AB=AC,过点B作射线BP交AD、AC分别于E、F,与过C点平行于AB的直线交于点P。 (1)求证:EB 2 =EF·EP; (2)若过B点的射线交AD、AC的延长线分别于E、F,与过C点平行于AB的直线交于P点,则结论(1)是否仍然成立?如果成立,请给出证明。
【简答题】如图,△ABC内接于⊙O,AD是⊙O直径,过点A的切线与CB的延长线交于点E. (1)求证:EA 2 =EB?EC; (2)若EA=AC, cos∠EAB= 4 5 ,AE=12,求⊙O的半径.
【简答题】(本题7分) 如图是一直角三角形纸片,两直角边AC=6,BC=8,现将直角三角形沿直线AD折叠,使AC边落在斜边AB上,且与AE重合. 小题1:(1)求EB长; 小题2:(2)求△DBE的面积.
【单选题】What can we infer from this passage?
A.
Black people buy tickets to see white people play games in NBA.
B.
NBA players who have ever-upward-spiraling paychecks shape the league's bad image.
C.
Emotional distance between NBA and the whites is NBA players' skills.
D.
Hip-hop culture is harmful to NBA.
【简答题】已知:⊙O中,OB、OC是半径,DF⊥OC于F,AE⊥OB于E,若AB=CD,求证:AE=DF.
【单选题】What's the best place to test the aroma of a particular perfume?
【多选题】What is aroma in Chinese culinary arts?
B.
the freshness of the materials
C.
the blending of seasoning
【简答题】如图,△ABC内接于⊙O,AD是⊙O直径,E是CB延长线上一点,且∠BAE=∠C. (1)求证:直线AE是⊙O的切线; (2)若EB=AB, ,AE=24,求EB的长及⊙O的半径.
【简答题】如图,在长方体 ABCD A 1 B 1 C 1 D 1 中,已知 AB =4, AD =3, AA 1 =2, E , F 分别是棱 AB , BC 上的点,且 EB = FB =1. (1)求异面直线 EC 1 与 FD 1 所成角的余弦值; (2)试在面 A 1 B 1 C 1 D 1 上确定一点 G ,使 DG ⊥平面 D 1 EF .