题目

. Tell the truth or just lie? You’re busy filling out the application form for a position you really need; let’s assume you once actually completed a couple of years of college work or even that you completed your degree. Isn’t it tempting to lie just a little, to claim on the form that your diploma represents a Harvard degree? Or that you finished an extra couple of years back at State University? More and more people are turning to final trick like this to land their job or to move ahead in their careers, for personnel officers, like most Americans, value degrees from famous schools. A阳春市八甲中学化学课外活动小组进行了一系列的实验，请按要求作答：（1）按要求从以下A-E装置中选择（填装置的序号）．甲同学要用石灰石和盐酸反应制取并收集CO2应选择BDBD；乙同学要收集一瓶O2，应选择C或DC或D．（2）小松同学使用图（Ⅱ）装置制取CO2，现有①Na2CO3固体；②块状大理石；③稀HCl；④稀H2SO4四种试剂，应选用的试剂是②③②③（填序号）；该反应的化学方程式是CaCO3+2HCl═CaCl2+CO2↑+H2OCaCO3+2HCl═CaCl2+CO2↑+H2O；反应进行过程中，关闭该装置中的止水夹a 后，可以观察到的现象是试管内液面下降（或长颈漏斗液面上升），反应液与块状固体脱离，反应停止试管内液面下降（或长颈漏斗液面上升），反应液与块状固体脱离，反应停止．