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The telephone is one of the most important inventions in the 20th century. With telephones our life has become convenient. Especially, after the mobile telephone appears, communication becomes easier and rapider. No matter how far away your friend is, you can always contact him with telephone. To students and people going out for business far away from their homes, the telephone can shorten the distance between them and their families. Thus they will get comforted whenever they are homesick or they run into trouble. With the help of the telephone, people can keep in touch with anyone at any time and in any place for urgent help. There are many kinds of telephones now. What's more, telephones are very cheap, so almost every family has a telephone. Besides making telephone calls to arrange social engagements and conduct business, telephones have many new uses, such as asking for information, listening to music and so on. The telephone plays an important role in our daily life. All in all, the telephone is so helpful that we can say that we could not live without the telephone in our daily life. We will further improve the performance of the telephone so as to create better conditions for its development. Exercises:Read the text and decide whether the following statements are true (T) or (F)( ) 1. The telephone is one of the most important inventions in the 20th century and has some usages. ( ) 2. People often make telephone calls, ask for information and listen to the music and so on. ( ) 3. Telephones make communication easier, rapider, more helpful and convenient.( )
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【单选题】表达产物具有生长因子受体功能的癌基因是
A.
src
B.
sis
C.
ras
D.
erb-B
【单选题】江苏98个县(市、区)都有少数民族居住,其中( )菱塘回乡族是江苏省唯一的少数民族乡。
A.
高邮市
B.
常州市
C.
泰州市
D.
南通市
【单选题】江苏98个县(市、区)都有少数民族居住,其中( )菱塘回族乡是江苏省唯一的少数民族乡。
A.
邮市
B.
常州市
C.
泰州市
D.
通市
【单选题】江苏98个县(市、区)都有少教民族居住,其中( )菱塘回族乡是江苏省唯一的少数民族乡。
A.
高邮市
B.
常州市
C.
泰州市
D.
南通市
【单选题】表达产物具有表皮生长因子受体功能的癌基因是
A.
src
B.
sis
C.
ras
D.
erb B
E.
myc
【单选题】江苏 98 个县 ( 市、区 ) 都有少数民族居住 , 其中 ( ) 菱塘回族乡 是江苏省唯一的 prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace> 少数民族乡。
A.
高邮市
B.
常州市
C.
泰州市
D.
南通市
【单选题】表达产物具有表皮生长因子受体功能的癌基因是
A.
src基因
B.
sis基因
C.
ras基因
D.
erb B基因
E.
myc基因
【单选题】有关癌基因的叙述,错误的是()
A.
是一类在自然或实验条件下具有诱发恶性转化的潜在基因
B.
原癌基因发生恶性转化后成为癌基因
C.
是正常细胞分裂生长的负性调节因子
D.
癌基因的激活表达是许多肿瘤细胞发生发展的重要步骤
E.
癌基因产物的功能可为生长因子、核转录因子、受体等
【单选题】表达产物具有表皮生长因子受体功能的癌基因是
A.
src 基因
B.
sis 基因
C.
erb B 基因
D.
ras 基因
【单选题】创建沉头孔时,需要在选择沉头孔,完成对沉头孔的创建。
A.
形状和尺寸
B.
孔的类型
C.
孔的形状
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