问题
选择题
下列选项不是单细胞生物是（ ）
A．变形虫
B．草履虫
C．眼虫
D．蚯蚓
答案
变形虫、草履虫和眼虫的身体都是由一个细胞构成的生物，都属于单细胞原生动物；蚯蚓是多细胞环节动物，整个身体的结构层次是：细胞→组织→器官→系统→动物体．
故选D
搜题请搜索小程序“爱下问搜题”
下列选项不是单细胞生物是（ ）
A．变形虫
B．草履虫
C．眼虫
D．蚯蚓
变形虫、草履虫和眼虫的身体都是由一个细胞构成的生物，都属于单细胞原生动物；蚯蚓是多细胞环节动物，整个身体的结构层次是：细胞→组织→器官→系统→动物体．
故选D
阅读下面短文，从短文后各题所给的四个选项（A、B、C和D）中，选出可以填入空白处的最佳选项，并在答题卡上将选项涂黑。 One day Tom bought , for two dollars , a large number of second-hand books . He put them in a 21 and pulled them to the 22 . He had to remain at work 23 three in the morning . At three , he began to walk home . The streets were dark . Tom could 24 wait to arrive home to begin reading his new books . “ 25 ! ” a voice shouted . But Tom was too 26 to hear the shout . A moment later , a gunshot went 27 his ear . He heard the shot . Tom turned to see what was 28 . An angry policeman ran towards him . The policeman didn’t 29 that the bag was Tom’s . He shouted at Tom , “ 30 it !” “Open it ! ” the policeman 31 . Tom opened it and the old books fell out of it . “Why did you not stop 32 when I shouted ?” the policeman asked , “If I could shoot 33 , you would be dead .” “I didn’t 34 you , ” Tom said , “ I am almost deaf . ” The policeman told Tom he was 35 for having shot at him . “ 36 would be better for you not to walk on the 37 at night . ” he said . Tom smiled , and told the policeman that his job 38 a clerk in the telegraph office was a 39 job . The policeman could think of 40 to answer this .
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