题目

下列方程变形正确的是A. 由–2x=3得x=–B. 由–2(x–1)=3得–2x+2=3C. 由得x+3(x–1)=2(x+3)D. 由得 答案：【答案】B【解析】分别对所给的四个方程利用等式的性质进行变形，就可以找出正确答案.A、系数化为1得，x=-，故错误；B、去括号得，-2x+2=3，故正确．C、去分母得，6x+3（x-1）=2（x+3），故错误；D、根据分式的基本性质得，，故错误；故选B．语篇理解 　　My brother Martin is really for the birds! He has pictures of birds on the walls of his room. He reads books about birds. He even goes on bird-watching trips. I used to think that was pretty silly. 　　Martin decided we needed more birds in our yard. He began building bird feeders. He built them out of wood, jar lids, plastic bottles, tins�you name it! Our yard was full of bird feeders. 　　After a while, a surprising thing happened. I started watching the yard more and more. It was so much fun to see the different birds coming and going! I liked to hear them sing, too. Pretty soon, I started running to Martin when I wanted to know the name of a new bird. Before I knew it, I was a bird watcher, too ! If you want to bring birds to your yard or apartment windows, here are a couple of easy bird feeders you can make. 　　1)Pop some popcorn. Take a needle and thread. String the popcorn onto the thread. Tie a knot at each end. Hang it out for the birds. 　　2)Find a pine cone. Tie a string around one end. Spread peanut butter on the pine cone. Stick sunflower seeds into the peanut butter. (1)What is the author's purpose in the last paragraph? [    ] A．To tell a funny story. B．To tell why you should feed birds. C．To give information about how to make a bird feeder. D．To tell many kinds of birds need feeding. (2)Which of these would be the best title for the story? [    ] A．"For the Birds" B．"The Story of Martin" C．"The Surprising Thing" D．"To Save the Birds" (3)Martin likes birds because ______　 [    ] A．he likes birds in his yard to eat insects B．he likes to observe them C．he likes to listen to them D．the birds can sing many songs (4)Which of the following is NOT TRUE? [    ] A．Martin knows many names of birds. B．"I" never like birds. C．We can make birds feeders with many things. D．You have to spend time on it if you want to watch birds. (5)From the story we know ______.　 [    ] A．we can never change our ideas B．birds always get food from bird watchers C．we must take good acre of birds D．interest is easy to have but you've got to put your heart into it