“三盯”工作必须有安排、有检查、有落实、有记录。

下列实验基本操作正确的是（　　）

A．

滴加试剂

B．

过滤

C．

检查装置气密性

D．

点燃酒精灯

哪一种维生素又称钴胺素（）。

A.维生素K

B.维生素B2

C.维生素B12

D.维生素B6

E.维生素B1

下列说法，不正确的是[ ]

A．糖类摄入不足，人易患低血糖；而摄入过多，则可能引发动脉硬化、冠心病等疾病

B．某些植物油和鱼油中的不饱和酯含量丰富，而动物脂肪中饱和酯含量较高　

C．蛋白质溶液遇到浓的硫酸铵等无机盐溶液，会析出沉淀，这个过程称为“变性” 　

D．人体对维生素的需求量很小，但是，人类的生命活动不可缺少它

下图反映了雪地、沙漠、湿地、小麦的反射光谱曲线，读图并回答下列问题。

（1）可见光的波段范围为________微米。

（2）从图中可以看出，不同的地物在同一波段其反射率不同；同一地物在不同波段反射率也不同，这是

    照片上判读各种地物的基础。例如，利用0.4——0.5微米波段的照片，可以把________与其他地物区分

    开，利用0.5——0.6微米波段的照片可以把沙漠与小麦、湿地区分开；利用0.7——0.9微米波段的照片

    可以把________和________区分开。

We had guests last night who have not stayed in a B&B hotel ago. They did not want breakfast because that they were going out early in the morning. They came back lately and had some tea. I came into the living room and saw one of them just go through the kitchen door but turn on the light. He was looking for a glass the cupboard. He had no ideas that the kitchen was not for guests. I just smiled to me and thought, "What can I do We are guests after all. \

______