阅读理解

     Many teenagers feel that the most important people in their lives are their friends．They believe that their families don't know them as well as their friends do．In large families，it is quite often for brothers and sisters to fight each other and then they can only go to their friends for some ideas．It is very important for teenagers to have one good friend or a group of friends．

     Even when they are not with their friends，they usually spend a lot of time talking with each other on the phone．This communication is very important in children's growing up，because friends can discuss something．These things are difficult to say to their family members．

    However，parents often try to choose their children's friends for them．Some parents may even stop their children from meeting their good friends．Have you ever thought of the following questions?

    Who choose your friends? Do you choose your friends or your friends choose you? Have you got a good friend your parents don't like? Your answers are welcome．

胰岛细胞的内分泌活动的协调有利于维持血糖平衡．如图表示胰岛素分泌的调节过程、胰岛素作用机理及引起胰岛素分泌异常的部分机理，其中抗体1、抗体2分别与相应受体结合后，能阻止葡萄糖或胰岛素与相应受体结合．

（1）由图可知：血糖平衡的调节方式是____ ，其中枢位于____．支配胰岛细胞的交感神经兴奋时，其末梢释放的神经递质促进胰岛β细胞的分泌，却不影响胰岛α细胞的分泌，原因是____ 

（2）胰岛素可通过作用于下丘脑神经元抑制胰高血糖素的分泌，验证此现象的实验思路是：将大鼠随机分成两组，一组在其下丘脑神经元周围施加适量的胰岛素溶液，另一组施加____，测定并比较施加试剂前后血液中____ ．

（3）用高浓度的糖溶液饲喂一只动物后，每隔30min检测其血糖浓度，结果见下表．请在答题卡指定位置构建一坐标图，并在坐标图上绘制血糖浓度变化的曲线图，并根据血糖浓度变化在同一坐标图上画出血浆中胰岛素浓度（μU•mL^﹣1）变化趋势的曲线图____ ．（4分）

（4）胰岛β细胞含有与某病毒相似的结构，若人体感染该病毒，自身免疫系统会产生（抗体1/抗体2）____ 消灭病毒时可破坏胰岛β细胞，引起Ⅰ型糖尿病，该病可通过____ 治疗．

在H₂、（NH₄）₂SO₄、SiC、CO₂、HF中，由极性键形成的非极性分子有　 ____，由非极性键形成的非极性分子有　 ____，能形成分子晶体的物质是　 ____，含有氢键的晶体的化学式是　 ____，属于离子晶体的是 ____，属于原子晶体的是 ____