【简答题】小鸡是由鸡蛋中胚盘发育来的,那么胚盘位于:____。
【单选题】What CAN'T you conclude from the passage?
A.
Miss Jarvis was devoted to her mother.
B.
Miss Jarvis knew many important persons.
C.
Miss Jarvis was very persistent.
D.
Miss Jarvis's efforts were not in vain.
【单选题】为了探究动物的行为,小明把鸡窝里正的孵化的鸡蛋全部移走,其结果是母鸡照样趴在鸡窝里孵卵.由此小明得出的结论是,母鸡的孵卵行为属于( )
【单选题】鸡蛋是由多个部分组成的,但是最终发育成小鸡的是( )。
【单选题】某校教师在讲解“鸟的生殖和发育”时,师:“大家知道,鸡是由鸡蛋孵化出来的,那是不是市场上或养鸡场里的鸡蛋都能孵出小鸡呢?下面我们就来找找答案,究竟哪些鸡蛋能孵出小鸡?”属于哪种导人方式( )。
【单选题】Miss Gorgers asked this question because she wanted to know whether.
A.
it was easy to phone to Los Angeles
B.
her student could hear her from 75 feet away
C.
her students had grasped(理解 ) her lessone
D.
sound waves were slower than electricity
【简答题】给出下列命题: ①函数f(x)=sinx+|sinx|(x∈R)的最小正周期是2π; ②已知函数 f(x)= acosx,x≥0 x 2 -1,x<0 在x=0处连续,则a=-1; ③函数y=f(x)与y=1-f -1 (1-x)的图象关于直线x+y+1=0对称; ④将函数 y=tan(ωx+ π 4 )(ω>0) 的图象按向量 a =( π 6 ,0) 平移后,与函数 y=tan(ωx+ π 6...