Question

Sometimes they may play to passers-by in the street or subway so that they can earn some______ money for themselves or to pay for their instruments.

A．certain

B．extra

C．various

D．unusual

Answer 1

B

考查词义辨析。certain 一定的，extra 额外的，various 各种各样的，unusual 不寻常的，句意：有时候他们可能在大街上或地铁给过路人弹奏，因此他们能挣一些额外的钱为他们自己或付他们的乐器。故选B。