由于乙炔（C₂H₂）中含碳量高，它在空气中燃烧会产生黑烟，下列物质在空气中燃烧也会产生黑烟的是（　　）

A．CH₄

B．H₂

C．C₆H₆

D．C₂H₅OH

Many people think that English soccer star David Beckham is( )a pop star( )a player.

A．mainly; than

B．either; or

C．very much; not

D．more of; than