D. A few farmers specialise by growing crops of high value.

These services tend to specialize their coverage by subject, industry, size, geography, publication, journalist, or editor.

The press also specializes in new and otherwise out-of-print books by Canadian authors.

He specialized in Italian glass, particularly by the firm Venini.

The store specializes in history, biography and books by and about women.

Then these doctors specialize by training for 3 or 4 years in Psychiatry.

The staff specializes by federal agency and works in certain communities.

The new house will specialize in books by public figures, journalists, historians and social critics.

The companies specialize in large cargo shipments by air, from machinery and computers to furniture.

The gallery specialises in contemporary paintings by younger and emerging artists from the three countries.