已知A={0，2，4}，CUA={-1，1}，CUB={-1，0，2}，求B=
{1，4}
根据题意可得文恩图如下：
所以
根据首字母提示写出单词。
1. True friends r______ us to show trust and loyalty(忠诚).
2. It won’t be easy to put the changes into e______.
3. My father swims twice a week to try and keep f______.
4. Jane wants to be an e______ in teaching small children when she grows up.
5. Mum helps his son out with an a______ of money when he lost his job.
为了防止Web服务器浏览器之间的通信内容被窃听，可以采用的技术为______。
A．身份认证
B．NTFS分区
C．SSL
D．FAT32分区
