题目

在鉴定还原性糖和蛋白质的实验中，下列哪项说法正确（） A . 斐林试剂的甲液和乙液可直接用于蛋白质的鉴定 B . 鉴定还原糖时，先加入斐林试剂乙液，后加入甲液 C . 两个实验都需要加热 D . 鉴定还原糖时，斐林试剂的甲液和乙液要混匀后加入 答案：D Waste can be seen everywhere in the school. Some students ask for more ______ than they can eat. Others often forget to ______ the lights when they leave the classroom. Many modern students usually buy new clothes though their old ones are not really “old”. They say they can ______ these things. But I don’t agree with them.Waste can bring a lot of problems. Although China is ______ in some resources (资源), we are short of others, for example, fresh water. In some poor areas, people even have no ______ water to meet their daily need, It is reported that we will have no coal or oil to ______ in 100 years either. So if we go on wasting our resources, what can we use in the future and where can we move?Think about it. What will our earth be like in the near future? It’s time to say no to the students who ______ things every day. Everybody should stop wasting as soon as possible.In our everyday life, we can do many things to ______ waste, for example, turn off the water taps (水龙头) when we ______ washing, turn off the lights when we leave the classroom and so on. Little by little, everything will be ______. Waste can be stopped one day if we do our best.【1】A.paperB.foodC.drinkD.money【2】A.turn downB.turn onC.turn offD.turn up【3】A.affordB.washC.findD.prepare【4】A.poorB.richC.beautifulD.popular【5】A.hotB.coldC.dirtyD.clean【6】A.useB.createC.produceD.invent【7】A.saveB.pickC.wasteD.pollute【8】A.protectB.decideC.designD.stop【9】A.rememberB.finishC.forgetD.continue【10】A.comparedB.designedC.markedD.changed