分析推理是化学学习中常用的思维方法，下列说法正确的是()
解：A、碱性溶液能使酚酞试液变红，滴入酚酞试液后变红的溶液一定呈碱性，该选项说法正确;
B、燃烧都伴随着发光、放热，但是有发光、放热现象的不一定是燃烧，例如电灯通电时发光，放热，不是燃烧，该选项说法不正确;
C、盐是由金属阳离子和酸根阴离子组成的，硝酸铵中虽然没有金属阳离子，但是属于盐，该选项说法不正确;
D、分子、原子都是不显电性的粒子，但不显电性的粒子不一定是分子或原子，例如中子不显电性，该选项说法正确.
Dogs are the best pets of humans. They come in all sizes. Some dogs are as small as a football, and others are as tall as a desk. Dogs’ fur (毛) is different, too. It can be long and soft, or smooth and hard. People don’t mind the kind of fur, because all dogs are good to hug.
请在字典中查一下这个词。
我喜欢甜食， 你知道的。
去年， 彼得在旅途中和许多人交了朋友。
我叫托尼· 史密斯， 史密斯是我的姓。
我们在课上回答问题时应该起立
Tea and coffee are two of the most popular drinks in the world. However, people usually like one more than the other. These drinks also have very different uses.
People in the office usually sit for most of the day when they work. But this is bad for a person’s health. When people sit for too long every day, they don’t move very much. So it is easy to start getting fat. Sitting too long is also bad for their work because it makes them want to sleep. When this happens, people may make more mistakes in their work or spend more time finishing their work. Companies need workers to be healthy, so how do they fix the problem?
