儿腹平片X线平片显示阑尾结石是A．经常出现的 B．无关紧要的 C．阑尾切除的绝对适应

You________ drink it, for it is poisonous.

A．can’t

B．needn’t

C．may not

D．mustn’t

请将下面的直接引语变成间接引语。

1. "Whenever my father is unhappy," Ann said, "he will go out and buy something, usually something

     large and useless.

2. "In most countries Red Cross stands for humanitarianism (人道主义)," said Mr. Jackson.

3. "You must leave a note for your mother," said Mabel, "otherwise, she'll be terribly worried when you're

     not in at your usual time."

4. "You can leave your motor cycle in my garage if you like," Mr. Corder said, "I'll keep an eye on it while

     you're away."

5. He said, "After the lecture I have to rush home."

6. Mary said, "I'm starting the work the day after tomorrow."

7. He said, "If what you said is true I must go to the police." 

8. "I know the umbrella belongs to you, but I thought it would be all right if I borrowed it," said my nephew.

9. "You mustn't forget to put the stamp on or your friend will have to pay double postage (邮资)," he told me. 

10. "I've left some books on your table," said Tom. "I think you'll find them useful. You can keep them as

       long as you need them, but I'd like them back when you've finished with them."

沃尔夫山姆第一次见到盖茨比时，他是一个刚刚离开军队的（）

A.中尉

B.上尉

C.少校

D.上校

简述DG1025／177－2型锅炉的结构形式。

国内航班旅客可以凭那些证件上飞机？