As some of the rules concerning foreign trade run contrary to the principles of the W

The old concerns lose importance and some of them vanish altogether.A．developB．disappearC．

As some of the rules concerning foreign trade run contrary to the principles of the W

The ______of the world ’s forests concerns e veryone in some way.A. destructionB. cons

We have the same problem as you concerning the learning of English.

Chomsky defines "competence" as the ideal users______ of the rules of his language.A．insti

Today concern for the environment extends into such areas as chemical pollution of the air