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翻译过程中需要哪四种组分？他们的功能是什么？

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listen and fill in the missing blanks.[音频]I (1)______ to come here on my first visit to your beautiful city. (2) all the members of my (3)_, I would like to take this opportunity to express our (4)_ thanks to our host for their earnest invitation and (5)____________ we have received since we set foot on this (6)_ land. I am also very happy that this visit has given me an excellent opportunity to (7)____ to you and to the people of Shanghai warm (8)_ and sincere good wishes of the government and people of my country. Although we live with a (9)_ of thousands of miles between us, "Long distance separates no (11)_____ friends,"as one of your Tang poets said.

生命体的遗传物质主要由DNA和RNA组成，遗传物质的生物合成可由复制和转录完成，试以大肠杆菌为例，论述转录与复制的区别。

地西泮不具有以下哪种作用()

A. 抗焦虑
B. 镇静
C. 催眠
D. 抗精神病
E. 抗惊厥

临床常用于催眠的药物是()

A. 苯二氮䓬类
B. 吩噻嗪类
C. 丁酰苯类
D. 巴比妥类
E. 以上都不是