化妆品对所好有的有毒物质有一定的限量，有毒物砷的限量是（）
A.1.0ug/g
B.10ug/g
C.1.0mg/g
D.10mg/g
参考答案：B
3.14×0.1○3.140.8÷0.98○0.98
0.14÷0.1○3.140.45×0.45○0.45．
The director of the language training department said that they needed to keep making an effort to tailor their programs __________ the needs of the individual.
A．to
B．for
C．by
D．about
