若函数f（x）=$\left\{\begin{array}{c}{x}^2+ax-2,x\le 1\\ -a^x,x>1\end{array}\right.$（a＞0，且a≠1）在（0，+∞）上是增函数，则a的范围是（　　）

通常用的蛋白质测试方法“凯氏定氮法”是通过测出含氮量来估算蛋白质含量，其含氮量一般不超过30%，而三聚氰胺的含氮量为66%左右，因此三聚氰胺也被人称为“蛋白精”．人和动物长期摄入三聚氰胺会造成生殖泌尿系统的损害、膀胱肾部结石，最终导致肾衰竭而死亡．以鼠为实验材料，请你设计实验，验证三聚氰胺对小鼠的危害性．

（1）实验步骤：

步骤1：选取生长状况相同的小鼠若干只，____ ．

步骤2：设置对照实验：甲组小鼠____ ，乙组小鼠____ ，作为对照．

步骤3：____ ．

步骤4：每天检测小鼠的健康状况，统计各组小鼠死亡的数目．

（2）实验结果预测____ ．

（3）实验结论：____ ．

在一杯水中滴入红墨水，静置一段时间后发现整杯水变红，此选项说明分子在____．将两块表面干净的铅块压紧后，即使在铅块下面挂了物体也不会将它们拉开（如图所示），这说明分子间存在____（选填“引力”或“斥力”）．

词汇运用 用所给词的适当形式填空
⑴Thank you for____ on them on the plane. (operate)
⑵I thought of my good friend when I read your____ (advertise)
⑶We should help all children to get an____   at school. (educate)
⑷His father died because of____ (ill).
⑸The old man is ____  to the policeman. (grate)
⑹I was made____ (read) the text once more by Miss Chen.
⑺I think I should Share his ____ when he is sad. (happy)
⑻He says that he wants to be a____ (fly) doctor when he leaves school.
⑼I don't know what made him laugh so____ (excite)?
⑽My watch doesn't work. It needs to____  (repair).
⑾Coffee ____  by most Chinese people. (not drink)
⑿He spend his spare time____  watching TV. (most)
⒀The car was one of the ____ . (run)
⒁ORBIS is one of the____  in the world. (charity)
⒂Many people in poor area don't have enough money for____  treatment. (medicine)