留心周围的生活情景，你会时刻从中感受到物理知识的无穷魅力．请判断如图所示四个情景中哪个说法是正确的（　　）

    The Internet plays ____ important part in our daily life. But some people spend too much time online. This is a new disease. Doctors call it Internet Addiction Disorder (互联网成瘾症)(IAD). People with IAD spend hours ____ (talk) online or playing computer games. Many people with IAD spend ____ (much) time on the Internet than with family or friends. Some people with IAD even give up ____ (they) jobs! Do you have IAD? Think about the following ____ (question): How long are you online a day? Is it a lot or a little? Do you get angry ____ (easy) when you can't play a game? Nowadays, millions of people have IAD in the world. Doctors give people some advice. First, ask yourself "How long should I ____ (be) online today?" Then try your best ____ (take) a break. What's more, you can use the computer or play games ____ (two) a week, not every day. ____ this way, you can have a good life with other friends.

阅读下列材料

材料一  我们现在应当非常谨慎，应当不采取对卷入冲突中的国家的防务不会有益而不只会使人激怒，甚至会挑起致命步骤的措施。

——摘自1962年赫鲁晓夫至肯尼迪的信

材料二  美国将参加各盟国和朋友的防务和发展活动，但是美国不能而且也不会制定全部方案，拟定全部计划，执行全部决定，负起保卫世界自由国家的全部责任。只有在我们的帮助真正起作用，并且被认为是符合我们的利益的时候，我们才会给予帮助。

——摘自1970年尼克松的对外政策报告

材料三  美国在欧洲、太平洋、中东以及其他美国疆界之外的地区，有着广泛的义务和安全利益。这就需要美国担当起“强有力的”、“令人信服”的“领导责任”。、

——摘自里根的讲话

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