NaCl是一种化工原料，可以制备一系列物质（如图）。下列说法正确的是 A.25 ℃，NaHCO3在水中的溶解度比Na2CO3的大 B.石灰乳与Cl2的反应中，Cl2既是氧化
Children do not think ___56___ way adults do. For most of the first year of life, if something is out of sight, it is out of mind. ___57___ you cover a baby’s favorite toy with a piece of cloth,
下面句子没有语病的一项是（ ）A．我们一定要发扬和继承闽东商人精诚团结、共谋发展的精神。B．为了防止甲型H1N1流感在全球范围内蔓延，各国
下列仪器，能够用来溶解固体、配置溶液、加热较大量液体的是（ ） A.试管 B.量筒 C.烧杯 D.锥形瓶
呼吸作用的意义，是为细胞生命活动提供（ ）A．氧气 B．二氧化碳 C．能量 D．食物
A teacher showed three toys to his students and asked them to find out the differences. All the three toys seemed to have the same shape, size and material. After looking at them carefully, t
Now that she is out of a job, Lucy _____ going back to school, but she hasn’t decided yet. A. had considered B. has been considering C. has been completed D. is goi
阅读下面这篇小说，完成文后（1）一(5)题。(24分) 扣 子 [前苏联]卡沙耶夫 瓦西利·维克托罗维奇·切尔内舍夫正在办公，同时用小电子计算器记
，且
的解集为
.
的解集；
有4个零点，求
的取值范围.
