题目

下列离子方程正确的是 A．饱和石灰水中通入过量二氧化碳：OH- + CO2 = HCO3- B．向稀硫酸中投入铁粉：2Fe +6H+ = 2Fe3+ +3H2 ↑ C．实验室制取二氧化碳：CO32- + 2H+ = H2O +CO2 ↑ D．氢氧化钡溶液中加入硫酸：H+ + OH- =H2O 答案：A阅读下面材料，在空白处填入适当的内容（不多于3个单词）或括号内单词的正确形式，并将答案填写在答题卡相应的位置上。Long ago the Emperor decided1.___________ (hold) a swimming race between 13 different animals. The order in which they finished would decide the order of their 2. __________ (appear) in the Chinese calendar (历法). All the animals lined up on the river bank and3. ___________ (give) the task of 4. __________ (get) to the opposite shore. The cat wondered how he would get across 5.____________ he was afraid of water. The ox worried how he would cross with his poor eyesight. The calculating rat suggested that he and the cat 6. _____________ (jump) onto the ox's back and guide him across. The ox, steady and hard-working, did not notice the two animals on his back. In the meanwhile, the rat 7. ____________ (run) behind the unsuspecting cat and pushed him into the water. As the ox came ashore, the rat jumped off and finished the race first. So the rat got the first year 8.___________ (name) after him and the ox got the second year. 9. __________ the lazy pig reached the finish line in 12th place，the race was over and he was awarded the final place on the calendar. From that day the cat, 10.___________ has never finished and lost his place on the calendar, became the enemy of the rat.