问题 单项选择题

某些细菌能通过其细胞膜摄取周围供体的染色体片段,并将此外源DNA片段通过重组参入到自己染色体组的过程,称为()

A、接合

B、性导

C、转导

D、转化

答案

参考答案:D

阅读理解

第三节:阅读理解(每小题2分,共40分) 

A

I had gone to bed after a very hard day when the phone rang. It was an eccentric(古怪的)  

farmer. I had never met him before although I had often heard people talk about him. He sounded quite nervous and he had been talking for a minute or so before I understand anything. Finally all I could make out was that someone called Millry had a very bad accident. No matter who she was I obviously had to go.

It had been snowing heavily that day. I didn’t know the way. I had been driving for at least an hour when I finally found his place. He was standing there, waiting for me. It seemed Millry had died. “She meant more to me than anyone…even my own wife!” he said. I could see that he had been crying. I thought something terrible had taken place, it may be a scandal(丑闻). I was even more shocked when he told me be had put her in the barn(厩). “I wouldn’t leave her out in the cold!” he said.

Millry had clearly been a secret lover of his. I was about to tell him he could not expect me to cover anything up when he opened the barn door. He lifted his candle and I saw a dark figure on the ground, “She was such a good cow! I wouldn’t let anyone but a doctor touch her!”  

he said, and bust into tears again.

56. The underlined phrase “make out” in the first paragraph means        .

A. expect        B. understand          C. see clearly        D. hear clearly

57. Before he arrived at the farmer’s house, the writer expected to see Millry lying       .  

A. on the ground of a barn        B. on the floor of a room

C. in bed in a room               D. in bed in a barn

58. The farmer wished that the writer might       .

A. look into the matter          B. bring Millry back to life

C. free him from a scandal       D. keep a whole thing a secret

59. The person who told the story is probably a             .

A. farmer        B. policeman       C. country doctor      D. newspaper reporter 

单项选择题