下图小试管中盛有几毫升水，与大试管连通的U型细玻管内放有少量的水（已染成红色）。如沿小试管壁小心地慢慢注入3mL浓硫酸，静置片刻后，U型细玻管中可观察到的液面现象是（   ）

绿原酸（C1₆H₁₈O₉）被誉为“第七类营养素”，它可以从我省栽种较广的杜仲（中药材）中提取。下列有关绿原酸的说法正确的是（）

2016年2月，******在党的新闻舆论工作座谈会上指出，要深入开展马克思主义新闻观教育，引导广大新闻舆论工作者做党的政策主张的传播者、时代风云的记录者、社会进步的推动者、公平正义的守望者。深入开展马克思主义新闻观教育的哲学依据是（    ）

①价值观是人们对事物价值的总的看法和根本观点

②价值观对人们认识和改造世界具有重要导向作用

③落后的价值观不能反映社会发展的方向和趋势

④先进的价值观对社会发展起积极的推动作用

根据短文理解，回答下列各题。

      CCTV reported that every year Chinese people throw away a lot of food; it can feed 200 million people for a year.

      Do we have too much food? Of course not. According to the UN World Food Program, there were 925 million hungry people around the world in 2010. Six million children die of hunger every year.

      Luckily, a number of people have realized the importance of saving food. Last November, Li Hong, a waitress in a restaurant in Nanjing, lost her job because she took some leftover(剩余的)food home for her son. Many people are by her side and criticized(批评)the waste behavior.

      What should we do in our daily life to waste less food? Here are some tips:

       ①Don't order too much food in a restaurant. Only order as much as you want to eat. If you cannot eat all the food you order, take the rest of it home.

       ②Don't be too picky(挑剔的)about food. Some food may not taste great, but your body needs it.

       ③Don't keep too much food at home, especially vegetables and fruit.

     “Every grain on the plate comes from hard work(谁知盘中餐, 粒粒皆辛苦).” It tells us everybody must save food.