问题 单项选择题 A1型题

铜绿假单胞菌导致角膜迅速溶解坏死的主要原因是()

A.铜绿假单胞菌生长速度快

B.角膜的微环境适合铜绿假单胞菌的生长

C.铜绿假单胞菌分泌的胶原酶降解角膜胶原纤维

D.引起了机体的抗原抗体反应

E.以上都不正确

答案

参考答案:C

解析:革兰阴性细菌角膜感染,多表现为快速发展的角膜液化性坏死。其中铜绿假单胞菌引起的感染具有特征性,该型溃疡多发于角膜异物剔除术后或戴接触镜引起的感染。也见于使用了被铜绿假单胞菌污染的荧光素钠溶液或其他滴眼液。起病迅速、发展迅猛,患者眼痛明显,严重的睫状充血或混合性充血,甚至球结膜水肿。主要原因在于铜绿假单胞菌产生蛋白分解酶,使角膜呈现迅速扩展的浸润及黏液性坏死,因此导致角膜快速溶解的原因选择C。

阅读理解

Now came great news! It came from a neighboring state, where the family’s only surviving relative lived. It was Sally’s relative—a distant relative by the name of Tilbury Foster, seventy and single. Tilbury now wrote to Sally, saying he should shortly die, and should leave him thirty thousand dollars, cash; not for love, but because money had given him most of his troubles, and he wished to place it where there was good hope that it would continue its evil work. The bequest would be found in his will, and would be officially handed over provided that Sally should be able to prove to the executors (遗嘱执行人).

As soon as Aleck had partially recovered from the strong emotions created by the letter, she sent someone to the relative’s home and subscribed for the local paper.

For the rest of the day Sally made confusion with his books, and Aleck could not keep her mind on her affairs, not even take up a flower-pot or book or a stick of wood without forgetting what she had intended to do with it. For both were dreaming.

“Thirty thousand dollars!”

All day long Aleck was absorbed in planning how to invest it, Sally in planning how to spend it.

There was no romance-reading that night. The children took themselves away early, for their parents were silent, disturbed, and strangely unentertaining. Two pencils had been busy during that hour —note-making; in the way of plans. It was Sally who broke the stillness at last. He said, with excitement, “Ah, it’ll be grand, Aleck! Out of the first thousand we’ll have a horse and a buggy for summer, and a cutter and a skin lap-robe for winter.”

Aleck responded with decision and calmness.

“You can spend a part of it. But the whole of the capital must be put right to work.

“Why, yes. Yes, of course. Have you got it invested yet?”

“No, there’s no hurry about that; I must look around first, and think, er…, I’ve turned it over twice; once in oil and once in wheat.”

“Why, Aleck, it’s splendid! What does it amount to?”

“I think — well, to be on the safe side, about a hundred and eighty thousand clear, though it will probably be more.”

“My! Isn’t it wonderful? Good heaven! Luck has come our way at last, Aleck!”

Then they went up to bed, but they left the candle burning in the sitting room. They did not remember until they were undressed; then Sally was for letting it burn; he said they could afford it, if it was a thousand. But Aleck went down and put it out.

A good job, too; for on her way back she hit on a scheme that would turn the hundred and eighty thousand into half a million before it had had time to get cold. 

小题1: Why would Tilbury like to give all his money to Sally?

A.Because Sally was Tilbury’s only relative alive.

B.Because Tilbury loved Sally and his family deeply.

C.Because Tilbury wanted his money to continue its function.

D.Because Sally and his wife are good at investing.小题2:The underlined word “bequest” in Paragraph1 probably means _________.

A.a gift of personal property

B.a proof of a person’s identity

C.a method of getting money

D.a reason for giving money小题3:What do we know about Sally and his wife after receiving the letter?

A.They were in deep sorrow and stayed up all night.

B.They cared little about the bequest and lived their life as usual.

C.They paid a visit to Tilbury to confirm the truth of the letter.

D.They had a big ambition to invest the money and make huge profits.小题4:Which of the following is the best title for the passage?

A.Thrilling News

B.Sally’s Distant Relative

C.The $30,000 Bequest

D.A Smart Investment

单项选择题