题目内容
（请给出正确答案）
A.针对缓存服务器的DNS Request Flood取击可以采用重定向方式验证源的合法性
B.对于授权服务器的DNS Reguest Flood攻击，可以通过触发客户端以TCP报文发送DINS请求：用以验证源IP的合法性
C.在源认证过程中防火造会触发客户端以TCP报交发送DINS请求，用以验证源IP的合法性，但在一定程度上会消耗OINS缓存服务器的TCP连接资源
D.重定向不可以对访问受攻击域名的源IP地址实施，还可以对访问受攻击域名的目的IP地址实施
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Luckily, most sheep______the flood last month.
A．endured
B．survived
C．lived
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A．ordinary
B．normal
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A．all their homes
B．all of whose homes
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______ the flood, the ship would have reached its destination on time.
A．In case of
B．In spite of
C．Because of
D．But for
Luckily, most sheep______the flood last month.
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B．survived
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D．passed
A．fertile
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