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1、九年级英语全册Unit 8对话练习（无答案） 人教新目标Unit 8对话练习 Dialogue One: Boy 1:OK.Now we n_to c_up w_a p_to tell people about the city park c_-u_. 1:Yeah,but Im _,Bob.Lets have l_first. Girl Girl 2:No,we cant _ _making a plan.Clean-up Day is only two w_from now. Boy 2:Youre right,Sally.W_we talk,Ill w_d_all our ideas.T
2、hen we can d_which ideas are b_. Girl 1:Umwellwe could _ _signs. Boy 2:Thats a good idea! 如果圆的半径为r，点到圆心的距离为d，则Girl 2:Ill h_o_advertisements after school. Boy 1:OK.Great!And we could e_c_up ten people and ask them to c_. (5）切线的判定定理: 经过半径的外端并且垂直于半径的直线是圆的切线.Boy 2:Hey,were c_u_w_a lot of 3. 圆的对称性:good i
3、deas,_we? Dialogue Two: 三三角函数的计算Man:This morning Im t_with a very g_young man,Jimmy(4)面积公式:(hc为C边上的高);the Bike Boy.Jimmy is the boy w_f_up old bikes and g_them a_.Good morning,Jimmy. 弦心距:从圆心到弦的距离叫做弦心距.Boy:Good _. (3)边与角之间的关系：Man:So,Jimmy,tell our l_what you do. Boy:Well,like you s_,I find or b_old b
4、ikes that nobody w_.Then I _ _the bikes and _them _to kids _dont have e_money to buy their _bikes. Man:Thats f_.What g_you the idea? （1）理解确定一个圆必备两个条件:圆心和半径,圆心决定圆的位置,半径决定圆的大小. 经过一点可以作无数个圆,经过两点也可以作无数个圆,其圆心在这个两点线段的垂直平分线上.Boy:I guess I t_a_my father. Hes always h_people. Man:Wow!You parents must be p_of you. Boy:I guess s_.But now Ive _ _ _money to buy old bikes. 上述五个条件中的任何两个条件都可推出其他三个结论。Man:Oh,thats too bad. (1)如圆中有弦的条件,常作弦心距,或过弦的一端作半径为辅助线.（圆心向弦作垂线）Boy:Yeah,I _to come up with some _of g_money or Ill have to s_.