问题 单项选择题

关于梅毒螺旋体的生物学特性,下述哪项不正确()

A.菌体有致密而规则的螺旋

B.两端尖直

C.有鞭毛

D.不能在人工培养基上生长

E.抵抗力弱,加热至50℃,5分钟内死亡

答案

参考答案:C

解析:梅毒螺旋体有8~14个致密而规则的小螺旋,两端尖直,运动活泼,革兰染色阴性,电镜下可见胞壁和胞膜,原生质圆柱体上紧绕3~4根周浆鞭毛,与运动有关。梅毒螺旋体不能在无活细胞的人工培养基上生长繁殖,抵抗力弱,在50℃,5分钟内死亡;血液中的苍白螺旋体在4℃置3天死亡。

阅读理解

信息匹配(共5小题;每小题2分,满分10分)

首先,请阅读一些关于针对学生在生活或学习中遇到问题给出建议的信息。

A.Try to talk to him, tell him it’s wrong for you two to do that. Then try to help him with his lessons in your spare time. If he can’t accept it, let it be. Maybe he’s not such a good friend.

B.You shouldn’t regret. The beauty of one’s looking or appearance doesn’t stand for everything. You are young and still depend on your parents. The most important thing is to study hard and you are sure to have a good future.

C.I used to have the same problem. You can try my ideas, they really work. First, talk about the things you like best and can do best. Then try to make friends you’re your neighbours.

D.You can get some examples from newspapers, magazines or TV shows, let her know it’s really bad.E. Tell him that he has done something good to animals. If he takes the eggs home, how will their mother feel when she can’t find them? On the other hand, what kind of birds are they?

F. Say sorry to him first. And try to repair it. Or you may give him your favourite toy car instead. Or buy a new one for him.

请阅读一些关于中学生所遇问题的信息,然后进行匹配。

1. My friend Jenny always takes a walkman with her and listen to loud music. I think it may hurt her ears. But she doesn’t seem to care.

2. Sam saw some bird eggs under a tree when we had a trip in the forest. He wanted to take them home. I stopped him. He’s angry with me.

3. Jack let me play with his favorite toy car. I make it go too fast and it crashed.

4. All my friends have many new clothes. They wear clothes in different style every day. But my parents can’t afford it. I think it’s ashame.

5. My close friend always wants me to give him the answers in exams. I do that. But I’m afraid I might be caught. If I don’t do that, he might not be my friend any more.

单项选择题