Composition writing. Please write a composition on the following topic. (250-300 words) Nowadays, many people cannot live without mobile phones. Do you agree that the problems outweigh the benefits of using mobile phones? Please give specific details and examples to support your opinion. You are to write in three parts. In the first part, state specifically what your view is. In the second part, support your view with two or three reasons. In the last part, support what you have written to a natural conclusion or summary. Marks will be awarded for content, organization, grammar and appropriacy. Failure to follow the instructions may result in a loss of marks.
下述分子的正确命名是:
A、2-羟基-5-氯-3-己烯
B、5-羟基-2-氯-3-己烯
C、5-氯-3-己烯-2-醇
D、1-甲基-4-氯-2-戊烯-1-醇
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