C
Everyone needs friends. There is an old saying, “Friends are God’s way of taking care of us.” But how do you find real friendship and keep it？
The American writer Sally Seamans tells young students some smart ways to find friends. Sally says finding friendship is just like planting a tree. You plant the seed（种子) and take care of it to make it grow.
First, you should choose a friend. What makes a good friend？ It is not because a person has money or good looks. A good friend should be kind and patient（耐心). For example, if you have a bad day, a good friend should listen to your complaints and do his best to help. To make a good friend, you cannot be too shy. You should make each other happy and share your lives.
But things cannot always be happy. Even the best friends have fights. What should you do when you have a fight with your friend？ You have to talk to him or her. When there is no one around, have an honest talk. If he or she doesn’t want to talk, you could write a letter.
There are three steps to being friends again:
Tell him or her how you are feeling; say what your friend has done wrong, and explain why you did this or that. Remember that friendship is the most important thing in your life.
49 Sally wants to tell students the ways to_____.
A find friends B plant trees C get happy D keep fit
50 What makes good friends？ A good friend should_____.
A be lovely and cool B be kind and patient
C have lots of money D have good looks
51 According to the text, you can________your friend after a fight.
A buy a present for B never say a word to
C have dinner with D write a letter to
52 What is the best title of the text？
A Teenagers and friendship. B The good friends around you.
C The trouble of growing up. D The care and keeping of friends.
病原体对不同免疫状态小鼠的感染进程如下图所示。下列相关叙述中，正确的是
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A．吞噬细胞缺陷小鼠的非特异性免疫受损，特异性免疫也无法产生B．B细胞缺陷小鼠虽无法合成抗体，但仍能对胞内寄生病原体产生免疫反应C．T细胞缺陷小鼠体内的抗原呈递作用不能完成，体液免疫无法产生D．正常小鼠免疫产生的淋巴因子，加强了效应T细胞和吞噬细胞对靶细胞的特异性杀伤作用
甲、乙、丙三组小鼠不同的免疫器官被破坏，其中甲组仅有体液免疫功能，乙组和丙组丧失了特异性免疫功能。现给三组小鼠分别输入造血干细胞，发现仅有乙组恢复了细胞免疫功能，出现这些现象的原因是
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A．甲组骨髓被破坏，乙组胸腺被破坏，丙组骨髓和胸腺均被破坏B．甲组胸腺被破坏，乙组骨髓被破坏，丙组骨髓和胸腺均被破坏C．乙组骨髓被破坏，丙组胸腺被破坏，甲组骨髓和胸腺均被破坏D．丙组骨髓被破坏，甲组胸腺被破坏，乙组骨髓和胸腺均被破坏
四、阅读理解（本题有两节，共16小题，每小题2分，共32分） 第一节：阅读下列材料并做后面的题目。从所给的A, B, C, D四个选项中，选出最佳答案。 A Have you seen big dogs in stores or restaurants and wondered why they were there？ Those dogs might have been guide dogs. People who are blind sometimes use guide dogs called seeing-eyes dogs. These special dogs help people get around. They help them do everyday things. Some people who have hearing problems have hearing-ear dogs. These dogs tell their owners when an alarm clock goes off or when the doorbell rings. Guide dogs learn to wear something on their backs called a harness. Their owner holds onto it. The dogs learn what words such as “left” and “right” mean. They learn to never take their owner into traffic. Each guide dog trains for months. Then, it spends one month working with its future owner. At that time ,the owner and dog get to know one another and train together! Because guide dogs are trained, they are welcome almost anywhere. So, the next time you are out, don’t be surprised if you see a dog. It might just be a guide dog!
__ use guide dogs.A. People who want dogs to play with B. Babies C. Anyone wants to D. People who cannot hear or cannot see
How long do guide dogs train？__A. days B. weeks C. months D. They don’t train
Guide dogs train with their owner for ______.A. two days B. one week C. one month D. one year
Guide dogs can go _______.A. almost anywhere B. only stores C. anywhere but restaurants D. only outside places
下图表示人体和人体细胞内某些信息传递机制的模式图，图示中箭头表示信息传递的方向。下列有关叙述中，正确的是
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A．如果该图表示反射弧，则其中的信息是以局部电流的形式传导的B．如果该图中的a为下丘脑、b为垂体、c为甲状腺，则c分泌的甲状腺激素增加到一定程度后，对a分泌d、b分泌e具有抑制作用C．如果该图表示细胞中遗传信息传递过程，则d过程只可发生于细胞核内D．如果该图表示细胞免疫过程，则a为效应T细胞，b为靶细胞，c代表抗体
下图为吞噬细胞杀灭病菌的示意图，请回答：
（1)这种吞噬作用与细胞膜的___\_有密切关系，对病菌的这种吞噬清除作用属于______免疫。（2)有些毒性很强的细菌，经过上述过程还不能被清除，只是暴露出这种病原体特有的抗原，传递给T细胞或___\_，使之增殖、分化成_______。（3)当细菌在体液中活动时，会被相应的__\_消灭；当该菌体进入人体细胞内部时，则被相应的___\_消灭。以上过程统称为_________免疫。