某固态物质加热变为液态时的温度随时间变化的图像如图所示，观察图像回答下列问题：(1)该物质是__________（填“晶体”或“非晶体”），其熔点是 ℃；(2)该物质在第3min时的状态是 态，此时它将_______（填“吸热”或“放热”）．
晶体 210 固液共存 吸热
题目分析：根据熔化特点可以把固体分为两种：晶体和非晶体。它们的主要区别是晶体有固定的熔点，而非晶体没有固定熔点。晶体熔化时的特点是吸热温度不变，此温度为晶体的熔点，熔化时晶体处于固液共存状态。
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| Peter wondered why he didn't have many friends. The reason was he was always taking, never 1 . One day Peter told Bill, "I'd like to give a 2 on Saturday. I'd like you to come and bring Martha, too." "Thanks, Peter, We'd be 3 to come. " "Perhaps you'd like to 4 your violin. You and Martha sing well together. I'm sure 5 will want you to sing for us. " That was how Peter began to 6 his party. Next he asked 7 friend, Betty, to bring a cake. "You make the 8 cake in the world, Betty, and I like to 9 your cake better than have one from the bakery (面包店). " Peter invited a few other friends to come to his party. He didn't 10 to ask for something from each one of them. He 11 asked the Jacksons to let him give the party at their house! They 12 . The party was a big 13 . However, as the guests were leaving, they said " 14 ." to Bill and Martha for the 15 , Betty for the cake, the Jacksons for the use of the house and to others for their hard work. To Peter they just said, "Thanks for the invitation. " | ||
| ( )1. A. giving ( )2. A. present ( )3. A. sad ( )4. A. get ( )5. A. everyone ( )6. A. give ( )7. A. another ( )8. A. most ( )9. A. taste ( )10. A. like ( )11. A. even ( )12. A. understood ( )13. A. chance ( )14. A. Thank you ( )15. A. house | B. getting B. cake B. happy B. take B. someone B. plan B. other B. worst B. make B. forget B. almost B. agreed B. idea B. Good-bye B. music | C. bringing C. party C. lucky C. bring C. no one C. have C. the other C. best C. eat C. remember C. finally C. refused C. success C. Sorry C. violin |