题目

1.You should call him back ____________ (出于尊重). 2.The park , ____________ (坐落在)the center of the town, attracts a lot of locals every day. 3.One more step____________ you will fall off the cliff. 4. ____________ (associate)with China, the Great Wall attracts many visitors every year. 5. Because of the changeable situation, they postponed_____________(make)a decision. 6. They rewarded the boy ____________bringing back the lost dog. 7.The industry in our province is developing ______________(大规模地). 8. Having lived in China for many years, he developed his _______1．下列各组中的关系正确的是（　　）A．同位素：O2和O3B．同分异构体：和C．同素异形体：K2O、K2O2、KO2D．同种物质：和