请选择（4）处的最佳答案
A. changing
B. variable
C. deviate
D. diverse
It can be inferred from the passage that white can be produced by
A. mixing different proportions of magenta, green and red
B. mixing equal proportions of green, red and blue
C. mixing different proportions of cyan, yellow and blue
D. mixing equal proportions of black, red and green.
One can always rely on him to be polite and do the right thing.
A. live on
B. depend on
C. live off
D. believe in
A．Road accidents.B．Street violence.C．Drug abuse.D．Lung cancer.
A. Road accidents.
B. Street violence.
C. Drug abuse.
D. Lung cancer.
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