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Which one is the correct answer?
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Section CDirections:In this section you will hear a recorded short passage. The passage is printed on the test paper, but with some words or phrases missing. The passage will be read three times. The first reading is for you to get the general idea. During the second reading, you are required to write down the missing words or phrases according to what you hear in order of numbered blanks. The third reading is for you to check your answer. Now the passage will begin.The networks that support electronic trade can1 all the; company’s activities, including marketing and sales, purchases and logistics（物流），production, 2 and engineering.The effectivenessof e-commerce reaches its full maturity when several of the3 operations are integrated with it:Informationcirculatesfrom the sales4 to those of purchasingand production.Informationconcerning sales is shared instantaneously(即刻的, 瞬间的) withwholesalers, delivery departments, manufacturers, originators and even raw materials suppliers.The securityofthe5 is ensured by the use of a protected payment server.
发光二极管和激光二极管相比说法错误的是：
在红光，绿光，黄光和蓝光LED中最先发明的是：
单色LED发光的颜色最主要和一下什么因素有关：
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