一个只含有字母a的二次三项式,它的二次项系数,一次项系数均为-3,常数项为1,则这个多项式为______.
由题意得:该多项式为:-3a2-3a+1.
故答案为-3a2-3a+1.
Most people have no idea of the hard work and worry that gointothe collecting of those fascinating birds and animals that they pay to see in the zoo.One of the questions that is always asked of me is 1 I became an animal collector in the first 2.The answer is that I have always been interested in animals and zoos.According to my parents, the first word I was able to say with any 3 was not the conventional “mamma” or “daddy”,4 the word “zoo”, which I would 5 over and over again with a shrill 6 until someone, ingroupsto 7 me up, would take me to the zoo.When I 8 a little older, we lived in Greece and I had a great 9 of pets, ranging from owls to seahorses, and I spent all my spare time 10 the countryside in search of fresh specimens to 11 to my collection of pets.12 on I went for a year to the City Zoo, as a student 13 , to get experience of the large animals, such as lions, bears, bison and ostriches,14 were not easy to keep at home.When I left, I 15 had enough money of my own to be able to 16 my first trip and I have been going 17 ever since then.Though a collector's job is not an easy one and is full of 18 ,it is certainly a job which will appeal 19 all those who love animals and 20.
请在6处填上正确答案()
A.volume
B.noise
C.voice
D.pitch
请结合给定材料,围绕“当前形势下如何保证经济又好又快发展”这一主题,自拟标题,写一篇文章。要求:观点鲜明,论述有力,结构完整,条理清晰,篇幅不少于1000字。