A.off
B.on
C.down
D.forward

The conclusion drawn by researchers is that
A.the skills of playing video games can be perfected by practice
B.playing video games make people smarter
C.those who play action video games are more efficient in collecting sensory information around them
D.videO．garners’performance in fulfilling specific tasks is better than non-gamers

What is the author’S attitude towards the market prospect of double．muscled fish？
A.Confident．
B.Ambivalent．
C.Expectant．
D.Indifferent．

In the author’s opinion，the real situation of racial equality in America is_______．
A.pessimistic
B.optimistic
C.desperate
D.hopeful

A.payments
B.fund
C.capital
D.allowance

The word“exonerate”is most closely in meaning to______．
A.confess the guilt
B.prove the innocence
C.execute the death
D.postpone the execution