Soda tax will lead to decrease in______．
A.soda drinking
B.calorie in—take
C.children obesity rate
D.employment rate
In the author’s opinion，the real situation of racial equality in America is_______．
A.pessimistic
B.optimistic
C.desperate
D.hopeful
According to the author，what should the government do about genetic test？
A.Inform. the public of the risk of it．
B.Legitimate the access to it．
C.Control the access to it．
D.Intervene when necessary．
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
设A为3阶可逆矩阵，将A的第2行加到第l行得8，再将B的第l列的（-1)倍加
