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| A.甲图中a是胰岛素,肝细胞上的受体与a结合后,可引起糖元的合成速率加快 |
| B.乙图中的b是细胞表面受体,其化学本质是糖蛋白 |
| C.丙图中的抗体是由游离于细胞质基质中的核糖体合成,内质网运输,高尔基体再加工后经外排方式分泌的,它的产生与释放都不需要能量 |
| D.发生丙图中生理过程的e细胞至少接受过两次过敏原的刺激,它释放的d物质为组织胺 |
(1)A萌发时所需的外界环境条件是___________________(写出其中一条)。
(2)B的主要部分是_____________。
(3)C中的_____________是裸子植物所没有的。
(4)D在完成_____________过程后,子房中的胚珠发育成 。
(5) 假设图中C的颜色为红色,已知R是红色的显性基因,r为黄色的隐性基因,请你写出C果实的可能基因___________。 查看习题详情和答案>>
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 |