The second Sunday of May is         Mother’s Day. It’s         special day for children to show their love to their mothers.

A．/; a

B．/; the

C．a; the

D．the; a

细集料筛分试验中，筛分后与筛分前的试样总质量相比，相差不得超过筛分前质量的（）。

A.0.10%

B.1%

C.0.50%

D.0.01%