A diachronic study of language is the description of language at some point in time.

When children learn to distinguish between the sounds of their language and the sounds that are not part of the language， they can acquire any sounds in their native language once their parents teach them.

What are the two objectives in presenting a new structural item?

The main objective of mechanical practice is to help learners to absorb thoroughly the＿＿of a language item.

Given a class whose instances, when found in a collection of objects, are sorted by using the compareTo()method, which two statements are true?（）

Generally speaking, there are six parts of speech in English. They are subject, predicate, object, attributive, adverbial and _____

The Unified Modeling Language is a standard graphical language for modeling object-oriented software（）can show the behavior of systems in terms of how objects interact with each other.

The Unified Modeling Language is a standard graphical language for modeling object-oriented software______can show the behavior. of systems in terms of how objects interact with each other．

The Unified Modeling Language is a standard graphical language for modeling object-oriented software．（ ）can show the behavior of systems in terms of how objects interact with each other．

The records of ship security training, drills and exercises shall be kept in the working language or languages of the shipIf the language or languages used are not（）, a translation into one of these languages shall be included.

The objectives of（）are to ensure safety at sea, prevention of human injury or loss of life, and avoidance of damage to the environment,in particular to the marine environment and to property.

In object-oriented program languages, a class must exposure its(13) to the outside.