1.I just want to be a doctor in the future!
2.A tortoise can live to more than one hundred years old.
3.I think that China will be the top one in the world in 100 years!
4.Lucy always do part-time job in her free time.
5.Look,that man is Mr.wang,but what is he now talking about?
6.Mr.Wang works in this high school.
7.After graduation,he found a job in a new company and then he became a computer programmer.
8.America is the first country to build the space station.
9.She fell in love with him the first sight she saw him.
10.I want to go skating on winter vacation.
11.Everyone was able to get out of the big fire.
12.My father is on vacation.
13.The 16th world cup was held in France.
14.Lily just want to keep a pet pig for her birthday present.
15.I have a job interview tomorrow.
16.I'll fly rockets to the moon.
17.My dream of becoming a doctor finally came true.
18.I saw jack take the purse just now.
19.None of your business,it's my own.
20.His favourite movies are science fiation movies.
21.can you help me with my poor English??
22.Hundreds of tu\ourists will come to China during the Beijing Olympic Games!
23.Jack's salary is the same as LIly's.
24.Mum,wake me up till 9 o'clock.
25.When you come across reading problems,just talk to me ,and I will help you.
26.The doctor tries his best to save his life, but failed.
27.Young children are easy to get bored.So try to get them feel fresh.
28.He learnt over and over,and finally he got it.
假设Z=10 则有X+Y=90 2X+Y=99 解得X=9 Y=81 ①
假设Z=20 则有X+Y=80 2X+Y=98 解得X=18 Y=62 ②
假设Z=30 则有X+Y=70 2X+Y=97 解得X=27 Y=43 ③
假设Z=40 则有X+Y=60 2X+Y=96 解得X=36 Y=24 ④
假设Z=50 则有X+Y=50 2X+Y=95 解得X=45 Y=5 ⑤