Is an apple a pure substance or a mixture?

An apple would be a mixture. While a mixture is a combination of elements and substances, a pure substance acts as an element itself, therefore, having the properties of only THAT certain element. 

An apple is a mixture because a mixture has chemicals such as water, vitamins, sugar, and lots more.

To view their body language, it's a huge part of spoken language as it can define what type of speech it is. For example if they have their arms close in they may not want to speak to you or if they are doing lots of hand gestures they are explaining something.