Dolphins are the most useful animals to humans. A．Right B．Wrong C．Not mentioned
A language is not just a collection of sounds, or even words. A language has a structure and what we call a grammar. The structure and grammar of a language help to give it meaning. For example, the two questions "Who loves Mary" and "Who does Mary love" mean very different things. If you stop to think about it, you will see that this difference doesn’t come from the words in the question but from the difference in structure. That is why the question "Can dolphins speak" can’t be answered until we find out if dolphins not only make sounds but also arrange them in a grammatical order which affects their meaning.