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(1)该特异性免疫属于 免疫,图中b细胞在人体内可以来自 细胞。
(2)图中a、b、c、d能够识别抗原的是 。(填字母)
(3)若图中所示的抗原为酿脓链球菌,因其表面的抗原决定簇与人心脏瓣膜上的一种物质的表面结构十分相似,物质d向心脏瓣膜发起进攻,使人患上风湿性心脏病,这属于免疫失调中的 病。
(4)当抗原经过⑤⑥过程时,人体内产生d的主要特点是数量多、速度快,与合成与分泌d有关的细胞器有 、 、
、 。
(5)研究发现,HIV病毒的增殖需要逆转录酶,从遗传物质分析,研究HIV疫苗比较困难的主要原因是 。 查看习题详情和答案>>
the monkey likes to live with the old man. Sometimes the old man is out, and his monkey guard home
for him. One afternoon, the old man is sleeping (睡觉) on his chair under the tree at his backyard. A
mosquito (蚊子) flies around him. The monkey finds it and tries to catch the mosquito, but he can't.
And then the mosquito stops on the old man's face. The monkey is very angry, so he picks up a stone...
The mosquito is dead (死的), but the old man gets very angry with the monkey. Do you know why?
B. smart
C. fat.
D. friendly
B. Because the old man gives him clothes.
C. because the old man is good to him.
D. Because the old man's home is comfortable.
B. Under a tree.
C. Behind a stone.
D. Near his backyard.
B. On the old man's arm.
C. On the old man's foot.
D. On the old man's face.
B. 满意的
C. 疼痛的
D. 迷惑的
B. Examinations
C. Education
D. Exercises
B. 动力
C. 表示
D. 努力
B. strong body
C. weak body
D. good father
B. have all kinds of sports after studying
C. not have sports
D. spend the free time on the studies and give up the sports
B. Education can go without physical exercise.
C. The students have to spend much time on all kinds of examinations.
D. The students don't get pressure from their parents and teachers.
Many students in China are learning English. Some of these students are small children. Others are teenagers(青少年). Many are adults(成年人). Some study at school, others learn by themselves. A few learn English language over the radio, on TV, or in the films. One must work hard to learn another language.
Why do all these people want to learn English? It is difficult to answer that question. Many boys and girls learn English at school because it is one of their subjects. They study their own(自己的) language and maths and English. Some people learn English because it is useful for their work. Many people often learn English for their higher studies, because at college or university(大学) some of their books are in English. Other people learn English because they want to read newspapers and magazines in English.
【小题1】根据Others are teenagers(青少年). Many are adults(成年人).描述,可知选C。
【小题2】根据短文第一段描述,可知孩子,年轻人和成人都在学英语。故选C。
【小题3】根据短文第二段描述,可知每个人学英语都有不同的原因,故选D。
【小题4】联系上文可知本文描述的是中国人学英语,故他们自己的语言是汉语,选A。
【小题5】by表示通过某种方式,通过自己学习英语,及自学英语,故选B。
【小题6】Are there many adults learning English in China?
A.No, they aren’t. | B.No, they are. |
C.Yes, there are. | D.Yes, there aren’t. |
A.Only teenagers. |
B.Only adults. |
C.Small children, teenagers and adults. |
D.Only small children. |
A. Most people learn English over the radio. |
B. All the people learn English at school. |
C. Students only learn their own language at school. |
D. Different people have different reasons for learning English. |
A.Chinese | B.English | C.French | D.Japanese |
A.和他们一起学习 | B.自学 | C.向他们学习 | D.通过学习 |
Foolish(silly) Freddie lived in a small village. The people of the village laughed at him. They liked to show visitors how silly Freddie was. They thought this was a funny thing to do.
One day, a visitor came to the village.
"Watch this", a villager said, and called to Freddie. "Come and play a game, Freddie, " he shouted. Freddie walked slowly towards him, a silly smile on his face.
"Look! Freddie, "the villager said, "I’ve got something for you." He showed Freddie a dollar coin and a much larger 50-cent coin."Which would you like?" he asked Freddie.
Freddie took the 50-cent coin at once.
The villager laughed."See how foolish he is," he said."He always does that. He’s too silly to learn anything." He walked away, leaving Freddie with the visitor.
The visitor felt sorry for Freddie and said to him, "Although the 50-cent coin is bigger than the$1 coin, the$1 coin is worth(值) much more.Two times as much."
"I know that," Freddie said."But once I take the$1coin, they’ll stop playing the game."
【小题1】根据第一段The people of the village laughed at him. They liked to show visitors how silly Freddie was.描述,可知选D
【小题2】根据第一段They liked to show visitors how silly Freddie was. 描述,可知选A
【小题3】根据最后一段The visitor felt sorry for Freddie and said to him, "Although the 50-cent coin is bigger than the$1 coin, the$1 coin is worth(值) much more.描述,可知他认为弗雷迪不知道这些硬币的价值.故选D
【小题4】根据短文最后一句话"I know that," Freddie said."But once I take the$1coin, they’ll stop playing the game."可知弗雷迪这样做只是为了让人们不断地给他钱,故选C,他其实很聪明.
【小题5】这篇短文主要描述了一个被村民们认为很傻的人,但是实际上这个人很聪明.故选B,foolish用引号括起来,表示相反的含义.
【小题6】People laughed at Freddie because__________.
A.he often made up jokes | B.he didn’t like money |
C.he looked very funny | D.they thought he was a fool |
A.how silly Freddie was | B.how clever Freddie was |
C.How kind people were to Freddie | D.that Freddie had much money |
A.Freddie did not know money was useful |
B.the villager was not kind enough to the boy |
C.Freddie did not get along well with the villagers |
D.Freddie did not know the dollar coin was worth more |
A.poor | B.kind | C.clever | D.silly |
A.Clever Villagers | B."Foolish" Freddie |
C.Freddie and a Visitor | D.A Visitor and the Villagers |