试题与答案

正整数系数二次方程ax2+bx+c=0有有理数根，则a，b，c中（ ） A．至少

来源：www.tikuol.com
题型：选择题

题目：

正整数系数二次方程ax2+bx+c=0有有理数根，则a，b，c中（　　）

A．至少有一个偶数

B．至少有一个质数

C．至少有一个奇数

D．至少有一个合数

答案：

被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0430/59cc6889ae08c3df44d3077c1ab8c196.html

下面是错误答案，用来干扰机器的。

This afternoon a charity sale was held on the playground in our school. Its purpose was to donate books to children in poor areas. If you bought one book, you gave...

考点：一元二次方程根的判别式
试题推荐
题型：完形填空
完形填空
     My dad has been driving a truck for almost his entire life.He's usually__1__all the weekdays and
comes home only at weekends.Sometimes he stays__2__for two weeks at a time.__3__I don't get to
see him as often as I wish, we remain very__4__.
     My dad is the type of person who doesn't let you__5__up anything that you start.When I was eleven,
my father bought me a piano.At first I was so__6__about it that I would spend hours and hours learning
how to play.Then it got __7__.I was so tired of it that I asked if I could stop.Much as I tried, he__8__
me to go on.Now I have been playing for almost five years.I love it and I'm glad I__9__my dad's advice.
     My dad is__10__talented, for he has been playing the guitar for over 20 years.Under his influence, I
also like__11__now.Sometimes my dad can be my biggest__12__.He makes me smile even when I lose
in a talent show__13__sometimes he can be my biggest critic (批评家). He__14__ignore the small
mistakes I make.He encourages me never to lose__15__because hethinks that all my efforts will__16__
one day.
     My dad is generous.Every Thursday night, he__17__to read to the children at a children's club.When
he reads, their__18__light up with curiosity about what will happen next.I feel__19__of having a person
in my family who cares enough to volunteer to__20__.
     I love dad with all my heart.He's a hero in my heart and the most wonderful person in theworld.
(   )1. A. on
(   )2. A. away
(   )3. A. In case
(   )4. A. polite
(   )5. A. give
(   )6. A. nervous
(   )7. A. rough
(   )8. A. promised
(   )9. A. received
(   )10. A. physically
(   )11. A. composing
(   )12. A. director
(   )13. A. however
(   )14. A. ever
(   )15. A. aim
(   )16. A. come true
(   )17. A. agrees
(   )18. A. bodies
(   )19. A. jealous
(   )20. A. help		B. with
B. home
B. Even though
B. kind
B. put
B. anxious
B. difficult
B. persuaded
B. challenged
B. typically
B. dancing
B. supporter
B. so
B. often
B. dream
B. take risks
B. likes
B. arms
B. optimistic
B. read 		C. out
C. inside
C. If only
C. different
C. take
C. crazy
C. disappointing
C. reminded
C. took
C. musically
C. writing
C. scholar
C. and
C. never
C. strength
C. pay off
C. intends
C. hands
C. proud
C. work 		D. in
D. alone
D. As if
D. close
D. speed
D. familiar
D. boring
D. suggested
D. listened
D. exactly
D. drawing
D. sponsor
D. still
D. even
D. heart
D. let out
D. offers
D. faces
D. happy
D. drive
查看答案
微信公众账号搜索答案