题目

解方程组： 答案：解： {3x+2y=21①2x−y=14② ， 由②得y=2x-14③， 将③代入①，得3x+2（2x-14）=21， 解得x=7， 将x=7代入③，得y=0， ∴方程组的解为 {x=7y=0 ．完型填空。阅读下面短文，掌握其大意，从题中所给的A、B、C、D四个选项中，选出最佳选项。When high school started, Becky and I became best friends. We 1 many interests and quickly became inseparable. When high school ended, we both cried because we would attend different colleges in the fall.Our first term of university life was 2. We had a huge telephone bill and our e-mails were incredibly long. In the second term, l found some new friends wih whom I felt very3. These were friends with whom I could be myself and 4 out my feelings. I was eager to share my new friends with Becky.When Becky finally visited me at my school, we were excited. She brought a toy bear as a present and told me about her college life. However, something unexpected happened when I 5 her to my new friends. Her eyes grew dark and l could see the 6 within them. My new friends tried to share their friendship, but Becky seemed 7 to accept it. I didn't understand why the people l loved most couldn't love each other.Becky left. I knew she was not happy. I thought long about what had happened. After many unanswered questions, I understood that she was 8. She saw me with my new friends and regretted that we longer shared the same experience. She saw all the fun l was having 9 her and wished she could be a part of it. She wished she could be in their 10.I wrote a letter to Becky11 she's always my best friends. I told her everyone had friends from home and friends from school, and all the friends were indeed life's greatest 12. Becky wrote me back soon. She was in 13 and felt sorry about what she had done.I think Becky and I both learn an important lesson from it. 14 can influence our friendship and change the experience we've shared. We are now walking on two different paths of life while new friends are special and exciting, old friends are always there,15 to share their heart and soul, no matter how far apart.（1）A.showed B.shared C.protected D.developed （2）A.hard B.peaceful C.modern D.normal （3）A.anxious B.strange C.familiar D.comfortable （4）A.pour B.make C.figure D.hold （5）A.admitted B.referred C.mentioned D.introduced （6）A.concern B.hurt C.curiosity D.doubt （7）A.unwilling B.cautious C.ashamed D.calm （8）A.aggressive B.jealous C.proud D.discouraged （9）A.without B.from C.for D.acorss （10）A.expectation B.relation C.reception D.position （11）A.recognizing B.explaining C.assuming D.predicting （12）A.achievement B.spirit C.gift D.sign （13）A.sympathy B.confusion C.surprise D.agreement （14）A.Something B.Anything C.Nothing D.Everything （15）A.waiting B.planning C.choosing D.demanding