设实数x，y满足：$\left\{\begin{array}{c}x+3y+5\ge 0\\ x+y-1\le 0\\ x+2\ge 0\end{array}\right.$，则z=2^x+4^y的最小值是（　　）

阅读材料，回答问题：

材料一：***最伟大的功绩，一方面自然离不开民族独立和中国的现代化，另一方面，是他真正把中国的千百万人民动员起来，充分进入到国家活动中去。

——费正清《伟大的中国革命(1800—1985)》

材料二：党的十八大报告充分论述和高度评价了“前三十年”对当代中国及中国特色社会主义创立具有奠基意义的两件大事：一是确立了社会主义基本制度,为当代中国一切发展进步奠定了根本政治前提和制度基础。二是在探索中国建设社会主义道路过程中,虽然经历了严重曲折,但党在社会主义建设中取得巨大成就,为新的历史时期开创中国特色社会主义提供了宝贵经验、理论准备、物质基础。

增加：在缺词处加一个漏字符号(∧)，并在其下面写出该加的词。

删除：把多余的词用斜线(\)划掉。

修改：在错的词下画一横线，并在该词下面写出修改后的词。

注意：1）每处错误及其修改均仅限一词。

      2）只允许修改10处，多者(从第11处起)不计分。

    One evening two German were walking in the street together. They tried to find a chance steal something. The clock struck 12. Most of the people had going to bed. Quietly they came to a house. There were no lights in the house but it seemed that everyone in the house were asleep. Standing at the front gate, one said in German to the another, “You wait here. I'll go around to the back door and then get into the house...” Suddenly out of the house ran a dog. The two men were frightening and ran away as fast as they can. They dared not to stop until they got to a lonely place “I hadn't expected dog could understand German,” one man said.