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问题 单项选择题

一幅512×512矩阵图像包含的像素数，下列数值最接近的选项是

A．5000

B．25，000

C．50，000

D．250，000

E．500，000

答案

参考答案：D

选择题

--- Is there any possible way to help them get rid of such a bad habit?

--- To tell the truth, it’s very hard. But we   on this problem trying to improve the situation.

A．worked

B．had worked

C．are working

D．had been working
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单项选择题

( )根及根茎

A．石菖蒲的入药部位为
B．郁金的入药部位为
C．天麻的入药部位为
D．川贝母的入药部位为
E．大黄的入药部位为
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