问题 实验题

下图为植物进化历程的图解:

(1)原始生命形成后由于营养方式的不同,一部分进化成不能自养的原始单细胞动物,另一部分进化成具有       的A。

(2)最早登陆的植物类群是B和C       ,但B和C的生殖离不开水。后来,部分C进化成原始的       ,包括D和E         。D和E的生殖脱离了水的限制,更加适应陆地生活。

(3)从植物进化的历程来看,植物进化的趋势是:                            

答案

(1)叶绿体

(2)蕨类植物 种子植物  被子植物

(3)复杂  低等 高等  水生  陆生

题目分析:植物进化的历程为:生活在海洋中的原始藻类,经过极其漫长的年代,逐渐进化成为适应陆地生活的原始的苔藓植物和蕨类植物,使原来的不毛之地开始披上了绿装,但是,它们的生殖还都需要有水的环境,后来,一部分原始的蕨类植物进化成为原始的种子植物,包括原始的裸子植物和被子植物,由于花粉管的出现它们的生殖完全脱离了水的限制,更加适应陆地生活,通过对不同类群生物的形态结构、生殖方式以及生活环境进行比较、分析,可以发现生物进化遵循由简单到复杂,由低等到高等,由水生到陆生的规律。

单项选择题

I first went to hear a live rock concert when I was eight years old. My brother and his friends were all fans of a heavy metal group called Black Wednesday. When they discovered that Black Wednesday were going to perform at our local theatre, they all bought (21) for the performance. However, at the last minute, once of the friends couldn’t go, so my brother offered me the ticket. I was really excited!

I remember the buzz (嘈杂声) of excitement inside the theatre as we all found our seats. After a few minutes, the lights went down and everybody became quiet. I could barely make out the stage in the (22) . We waited. Then there was a roar from the crowd, like an explosion, as the first members of the band stepped onto the stage. My brother leaned over and shouted something in my ear, but I couldn’t hear what he was saying. The first song was already starting and the music was as (23) as a jet engine. I could (24) the drum beats and bass notes in my stomach.

I can’t recall any of the songs that the band played. I just (25) that I really enjoyed the show and didn’t want it to (26) . But in the end, after three encores (加演), the show finished. We left the (27) and walked unsteadily out onto the pavement. I felt a little dizzy, as if I had just woken from a long sleep. My ears were still (28) with the beat of the last song.

After the (29) , I became a Black Wednesday fan too for a few years before getting into other kinds of music. Once in a while, though, I listen to one of their songs and (30) I’m back at that first show.

27()

A.party 

B.theatre 

C.opera 

D.stage

单项选择题