题目内容
DOS攻击的SYN flood攻击是利用（ ）进行攻击。
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以下关于Smurf攻击的描述错误的是（ ）
Listen to the following passage and fill in the blanks with the words you hear. When you think about dolphins, you might picture them swimming playfully near boats or doing __1__ at a water park. Dolphins spend their whole lives in the water. These __2__ animals look like big fish, so it may surprise you to learn that they are mammals (哺乳动物). As all mammals do, dolphins __3__ air. Dolphins must come to the water’s __4__ to breathe. A dolphin breathes through an __5__, called a blowhole, on the top of its head. Dolphins are considered _6___ animals. In captivity, dolphins have shown that they can learn tricks and __7__. Scientists also discovered that dolphins have good __8__ skills.
理想指引人生方向，信念决定事业成败，没有（）就会导致精神上缺钙。
毛主席提出，（）第一，学习第二。
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