已知m、n是关于x的一元二次方程x2+2ax+a2+4a-2=0的两实根, 那么m2+n2的最小值是( )。
阅读短文,从方框中选择适当的词并用其正确形式填空,使短文通顺、意思完整。请将答案填写在答题卡的相应位置。每空限填一词,每词限用一次。方框中有两个词是多余的。
Electricity is of great 小题1: to our life. What would life be like without electricity? “That’s terrible!” most people would say. But it’s life in Ethiopia.
When I was in that country, the power went off 小题2:every few days. This happened not only in small towns, 小题3:even in the capital.
One day when I went to the airport, the power was 小题4:. I didn’t know which flight to take. At the same time, the Internet was of course 小题5: The weather was very hot. To my 小题6:, restaurants only served warm drinks. Time after the sunset, between 6:00 p.m. and 8:30 p.m., was 小题7:. Without any light, I stayed in my room, walking or 小题8: in bed. How boring!
I wondered what 小题9: I would get into if there was no power in America. So I had a try. At 8:30 a.m., I turned off the power. Then I 小题10: nothing but rest at home. Things were not so difficult because it was summer and the sun didn’t set until 8:00 p.m. I’ll try this again in winter, and I hope to learn what I can do without electricity.
①封锁疫区内与所发生动物疫病有关的;②疫区内易感染的;③依法应当检疫而未经检疫或者检疫不合格的;④染疫或者疑似染疫的;⑤病死或者死因不明的;⑥其他不符合国务院兽医主管部门有关动物防疫规定的动物和动物产品应当______
A.禁止经营、运输、加工、贮藏B.禁止屠宰、经营、运输、生产、加工、贮藏C.禁止屠宰、生产、经营、加工、运输D.禁止经营、生产、加工、贮藏、运输E.禁止屠宰、生产、加工、贮藏、运输