5. D　主旨大意题。作者并未对Musk的计划表露任何个人见解，只是客观地陈述一些相关事实。

　　. 1. To end the existence of war. / To abolish the war.

　　2. Nuclear weapons.

　　3. Bacteriological or chemical weapons.

　　4. Man begins to realize the danger of nuclear war./ All the people know the nuclear war must be kept away.

　　Ⅴ.One possible version：

　　Dear principal，

　　I'm Li Hua, a student from Senior Grade Three. Facing the university entrance examination, we all concentrate on our studies. However, recently I find some students bring their mobile phones to the classroom and we often hear the ringing of mobile phones, which has a bad effect on our study. What's worse, some of them even waste precious studying time in class typing short messages on the mobile phone. In my opinion, the classroom is a place for students to study, so quietness is badly needed for us to learn our lessons.

　　To keep the classroom quiet, I suggest our school make the following rules about the use of mobile phones in the classroom. First, those with mobile phones should turn them off in class. Second, they should not talk on the phone or send short messages in the classroom. I think, if anyone breaks the rules, proper ways should be thought of to punish him or her.

　　I would appreciate it if you can take what I said into consideration! Thanks!

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