题目

下列有关孟德尔“假说—演绎法”的叙述，不正确的是 A.提出了性状是由染色体上的遗传因子控制 B.测交实验是对推理过程及结果进行的检验 C.体细胞中遗传因子成对存在，配子中遗传因子成单存在属于假说的内容 D.提出问题是建立在纯合亲本杂交和F1自交两组豌豆遗传实验的基础上 答案：A13．The clock struck eleven at night．The whole house was quiet．Everyone was in bed except me．Under the strong light，I looked sadly before a huge pile of troublesome stuff they call"books"．I was going to have my examination the next day．"When can I go to bed？"I asked myself．I didn't answer，in fact I dared not．    The clock struck 12．"Oh，dear!"I cried，"ten more books to read before I can go to bed!"We pupils are the most wretched creatures in the world．Dad does not agree with me on this．He did not have to work so hard when he was a boy．"    The clock struck one．I was quite hopeless now．I forgot all I had learnt．I was too tired to go on．I did the only thing I could．I prayed，"Oh，God，Please help me pass the exam tomorrow．I do promise to work hard afterwards，Amen．"My eyes were heavy，so heavy that I could hardly open them．A few minutes later，with my head on the desk，I fell asleep．21．When the author was going over his lessons，all the others in the house wereA．A．asleep    B．working in bed    C．outside   D．quietly laughing at him22．What do you suppose happened to the author？CA．He went to a church to pray again   B．He passed the exam by luckC．He failed in the exam            D．He was punished by his teacher23．The best title for the passage would beA．A．The Night Before the Examination  B．Working Far into the NightC．A Slow Student                 D．Going Over My Lessons．