题目

As the saying goes, A hero is known in the time of misfortune（不幸) . Zhong Nanshan is a hero like this. He is a doctor in Guangdong, who _________ many people's lives in 2003. In 2003, SARS ________ in Guangdong. Later, it spread across China and other parts of the world. Patients coughed a lot and got fevers. Hundreds of ________ even died from the disease. Even many doctors and nurses got SARS when they treated patients. So everyone was afraid of it. But Zhong was _________ enough to fight the disease. Zhong spent days and nights to find the cause _________ the disease. And with his way为研究土壤中无机盐离子和空气中CO2浓度对植物光合作用的影响，有人用同一环境中生长的两种植物，在适宜条件下做了模拟试验，结果如表．请据此回答问题．项　　　　目植物346μmol?mol-1的CO2528μmol?mol-1的CO2不施磷肥施磷肥20kg?hm-2?a-1不施磷肥施磷肥20kg?hm-2?a-1光合速率μmol?m-2?s-1A2.123.703.605.76B1.326.705.3815.66（1）根据实验结果，施磷肥对植物 的光合作用影响更大．（2）如果将CO2浓度从346μmol?mol-1迅速提高到528μmol?mol-1，植物细胞中C5的浓度将 ．（3）假如植物B为小麦，在干旱初期，光合作用速率明显下降的主要原因是 ，反应过程受阻；在灌浆期，若遇阴雨天则会减产，其主要原因是 反应过程受阻．（4）土壤中缺磷会导致植株矮小、叶色暗绿，影响光合作用效率．有人推测叶色暗绿的原因是缺磷导致叶片中类胡萝卜素缺乏引起的．请用正常生长的黄瓜幼苗作实验材料．设计实验进行探究．实验所需试剂：完全营养液、 、丙酮、层析液、CaCO3、SiO2．实验步骤：第一步：选取长势相同的黄瓜幼苗平均分为甲、乙两组第二步：甲组培养在完全营养液中，乙组培养在 ，将两组黄瓜幼苗同时放在相同并适宜的条件下培养一段时间．第三步：分别取两组黄瓜幼苗等量的叶片进行色素提取和分离实验．提取时研钵中需加入 以防止研磨中色素被破坏．将画好滤液细线的滤纸条轻轻插入层析液中时，一定要注意： ，以避免实验失败．实验结果预测：对比甲、乙两组实验层析分离结果，若 ，则说明缺磷不会引起类胡萝卜素的缺乏；若乙组滤纸条 ，则说明缺磷会影响类胡萝卜素的形成．