What is true about verbal language?

A、 Foreign language learners should pay special attention to the slang and idiomatic expressions used by native speakers.
B、 Meanings will vary depending on the context which can be hard for foreign language learners to comprehend.
C、 Things or concepts are represented by one or perhaps two terms in one language, but by many more terms in the other language.
D、 The cultural connotations of words can make the difference between an active social life and none at all.
E、 A term in one language does not necessarily have a counterpart in the other language.
F、 Terms have more or less the same primary meaning, but have secondary or additional meanings that may differ considerably from each other.